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File type: Calendar file, CALS raster, Cakewalk Application Language script, CyberAudioLibrary link, Daqarta Extended audio data, digital camera firmware update, QV Map Geographic coordinates, radiance function file format, schedule data, superCalc worksheet


Problem with a CAL file? Does your computer fail to open?  Know here what CAL files are and how to open your CAL files.


What is a CAL file?

The file extension Cal is commonly associated with calendar and scheduling applications. The CAL files have the events and dates included in the calendar schedule. It may contain for each calendar month custom images.

Among the many uses of the CAL file extension is to name the calendar files of many applications. These include:
  • American Greetings CreateaCard,
  • PrintMaster,
  • Broderbund software,
  • Printmaster,
  • DOS Calendar Creator,
  • MS Windows 3.x Calendar,
  • HTML Calendar Maker Pro,
  • and Print Shop.
cal image
Similar to its function as a calendar file, the CAL file extension also names CALS Raster files. This is another bitmap format file developed during the 1980s.
Back then, it was the standard graphics data interchange for electronic publishing for the government. The name CALS is the acronym for Computer Aided Acquisition and Logistics Support.
Today, that same extension is for several graphics applications like:
  • the Adobe Photoshop,
  • Graphics Converter Pro,
  • PhotoPhilia,
  • and Paint Shop Pro.


CAL files are developed in the 3ds Max software that is used for 3D modeling and animation. It has the Biped characters stored in FIG files in association with CAL files can be.


How to Open CAL files?


Unable to open CAL files on the computer may be due to various reasons. The foremost reason is lacking suitable software to support CAL installed on the device. The simplest way of solving this issue is to download the appropriate application.


Category: Graphic files, Data files, Script files, Audio files
File format: Proprietary
Open with Windows:
  • Broderbund Print Shop,
  • Calendar Creator,
  • American Greetings CreateaCard,
  • Adobe Photoshop,
  • Corel Paint Shop Pro Photo X2,
  • Graphics Converter Pro,
  • Cakewalk Application Language,
  • CyberAudio, Daqarta,
  • DOS Calendar Creator,
  • HTML Calendar Maker Pro,
  • PhotoSmart 850 Digital Camera,
  • QV Map, Radiance Function,
  • SuperCalc,
  • MS Windows 3.x Calendar
Open with Linux:
  • Broderbund Print Shop,
  • Printmaster,
  • Adobe Photoshop
Moreover, the CAL file works as an application language script file for Cakewalk. This is a programming language used to process various events. Cakewalk can be used to extend Pro Audio as well as Professional with its custom-editing instructions.
The CAL file extension is also an audio file for Daqarta, an audio application to produce better performance of the Windows sound card. CyberAudioLibrary also use the CAL file extension as its audio file.
Meanwhile, this file extension works as a useful coordinates file for the QV Map Geographic. This application creates a topographic file with the PNY file extension. This file is used for some GPS applications. The CAL file extension works as a geographic coordinates for every PNY file.


Likely problems with CAL format files

The inability to operate or open the CAL file always does not mean you have not installed the software on your computer. Other issues are blocking the ability to operate the CAL S Raster Image Format File. However, here is a list of likely problems opening the CAL files:

  • CAL file corrupted when it is being opened.
  • Incorrect links in registry entries to the CAL file.
  • Accidental deletion of the CAL description from the Windows registry
  • Incomplete installation of application supporting the format of CAL.
  • The CAL file gets infected when it is open with some undesirable malware
  • The computer lacks hardware resources to handle the CAL file opening
  • Equipment drivers used by the computer are out of date to open a CAL file.


If you are certain that any of these reasons exist or maybe the problem in your case, you should check. If not, the CAL file will operate without any problem with your programs.

Also, If the CAL file problem is not any of all these likely issues. Then it may be some rare problem in the opening of the CAL file. The only option now is to seek staff assistance.


How to associate with installed software?


If you wish to associate CAL file with some new program, you can do it in two ways:

  1. The easiest and the first way is to select a CAL file and right-click on it.
  2. From the drop-down menu, ‘choose default program'.
  3. Click on ‘Browse' to find the desired program.
  4. You should confirm this operation entirely by clicking ‘Ok.'


  • The tough and second way is to associate the file extension of CAL in the Windows Registry to the corresponding software.


Many files just contain simple text data. If you try to open the file with a text editor like notepad. Then some data will be encoded.

This method facilitates you to glance at the file’s contents, but it may not be possible to see in a structure as a program actually supports to dedicate seeing them.





File type: Comic Book RAR Archive

What is .CBR

Invalid file associations could be the result of underlying issues within your Windows PC. It is highly recommended to scan your PC for invalid registry entries, unused processes and other slowdown issues.
It is a renamed RAR file that can be decompressed with any decompression tools. The CDisplay particularly displays the images of the comic book stored in the CBR file. In addition, the CBR file need not be decompressed when this program is used. The files saved in the CBR file extension are PNG, GIF and JPEG files. The pages stored are displayed one or two at a time. Not all the decompression tools will be able to display the comic book images in a book format. Also, there might be extra characters that will be displayed upon decompressing the file when the tool used does not have full support on the CBR file extension.

How to Open CBR Files

Category: Compressed Files
File format: Proprietary
Open with Windows: CDisplay, Smith Micro Stuffit Deluxe-Save 20%
Open with Linux: Comix, other decompression tools
Image files are said to have large sizes when saved on one document that is why the CBR file extension is used. It is to compact the large file sizes of the comic book images and for easy downloading.

  • File type: Downloads
  • Description: Chrome Partially Downloaded Files. Google Chrome download in progress. Chrome resume download.
  • Extension: .CRDOWNLOAD

crdownload file

What is a .CRDOWNLOAD file

The CRDownload file extension represents a file downloaded in the google chrome browser or Chromium. It can be in one of the following status:

  • Partially downloaded or in progress.
  • A cancelled download.
  • A paused download

If you see this file type on your computer make sure you are not already downloading something. It is either unconfirmed or uncompleted.

google chrome downloads

Usually .crdownload files are incomplete. When the download finishes google chrome deletes the file from the system. If there is an interruption it will not be possible to delete it automatically. In this case the user will have to delete it manually.

In general this format is useless. It can not be viewed or recovered. But before deleting it, make sure you run google chrome. The browser will do some checks with it.

How to recover or convert a .CRDOWNLOAD file

If you are using Google Chrome or Chromium your download is is this format before finishes. If there is an interruption you can recover the files partially.

  1. Search for your crdownload files.
  2. Delete the extension .crdownload.
  3. Open with the appropiate program. Depending on the download type it can be a document, an image, a video.
  4. If it doesn't work you will have to download it again.

How to open CRDownload Files online free

The following openers are available online. Select an opener or reader application and download it.

Category: Web Files or misc.
File format: Open-Source
Open with Windows:
Open with Linux:
Open with mac os:
  • Chromium of Google Chrome
This extension was created by google.


What is a unconfirmed CRDownload?

These files are a stopped or paused download. You can delete it if you don't want to resume the download, if not you have to keep it.

How to convert from CrDownload to MP4?

There is no way to do the conversion online and free. However, if the downloaded file is a MP4 then you can rename it to .MP4. This will be like a conversion.

For example, video.crdownload will be renamed to video.mp4


In general, you can convert these files to their original format: PDF, APK, MP3 or others.


What is a Unconfirmed CRDownload Virus?

The unconfirmed virus is a file, with the name 325046.crdownload that is a virus. It is a trojan virus. The idea of this archive is to access remotely to steal information. Be aware and don't download any filename like this.


How to resume

To resume it you have to manually unpause or resume the download files.


Can I Delete the files safely?

You can delete the crdownload file safely if the download is finished. However if the download is paused or running you have to wait for it to finish.


How to view downloads in Chrome

  1. Open Google Chrome Browser
  2. Type in the navigation bar chrome://downloads/ or click CTRL + J

There you can view and delete the downloads in Google Chrome the completed ones and also the failed and unconfirmed.


How to create a .CRDOWNLOAD file

You can't create these files for yourself. Only Google Chrome creates them when a download starts.

File type: Cheat Engine Cheat Table


The CT file extension is used to symbolize the Cheat Table files saved by the Cheat Engine software users. As the application's name suggests, it is intended to provide video game players with a distinct advantage by allowing them to cheat on majority of computer gaming applications. This format file can only be made accessible or modified through the use of the Cheat Engine program.

The CT format file is used as a container unit for the listing of different game attributes which can be shared with other players of the same video game to omit the need for retyping the cheat commands during runtime of the game.

The contents of this file normally cover manual addresses, pointers, and scripts which are broken down to allow the use of unlimited resources during the game time.


Detailed information 

Category: Data Files
File format: Open-Source
Open with Windows: Cheat Engine
Open with Linux: N/A
This tool is basically an open-source utility which allows other game developers or players with programming experience to implement additional feature sets (authorized or otherwise) for the application. The CT file extension supports useful functionalities which can be used for debugging of computer games and normal programs as well.
The program responsible for creating this file format also features a memory scanner module to search for application variables utilized during the game. This provides the gamer with the ability to change their values. The CT file extension also supports the assembler, disassembler, trainer maker, speedhack, system inspection tools, and direct 3D manipulation tools of the software.
The installation process includes the extraction of a tutorial file intended to serve as a reference for users with no programming background. The Cheat Engine is currently the most popular free application in the market in the area of cheating software.
During the earlier part of its deployment, it also made a tremendous impact on the online gaming market providing players using the application with an advantage against their competitors. The CT format file is also used in relation to the creation of Aimbots.

File type: Hypertext Cascading Style Sheet


The CSS file extension represents the Hypertext Cascading Style Sheet document, a specification developed intentionally for the delivery of style sheets in Web pages. Style sheets allow the developer to design a specific look and apply the design in various places via simple instruction sets.

Cascading technology allows the application of styles within styles in a Web page.

The CSS format file provides the user with the functionality of formatting fonts, tables, line spacing, text indentation, and object positioning relative to a specific Web page.

The CSS format supports the stylesheet language that works in conjunction with the markup language used in Web page programming.

In this context, this format file is commonly found together with an XHTML and HTML file formats with additional functionality for inclusion in XML, XUL, and SVG document types.


Detailed information 


Category: Web Files
File format: Open-Source
Open with Windows: Any Standard Text Editor, Internet Explorer, Windows-based Web browsers
Open with Linux: Any Standard Text Editor, Linux-based Web browser
The separation feature provided by the CSS file extension allows the improved accessibility of content, control of particular characteristics associated with the presentation, reduction of repetition and complexity with regards to structural content. It also provides additional Web page flexibility.
The specifications related to this development language are maintained by the W3C (World Wide Web Consortium) which was registered with the RFC 2318 in March 1998.
The syntax utilized by this scripting language is basically composed of keywords in conventional English primarily for describing style properties. Every rule covers a number of selectors including a declaration block.
This block is made up of declarations enclosed with braces and is terminated by semicolons.
Pseudo-classes can also be utilized for defining additional content behavior like when pointing to a visible element associated with a mouse cursor over functionality. Some examples of these pseudo-elements and pseudo-classes are :before, :lang, :visited, or :first-line.

File type: eCopy Scanned Document, Atari Ramdrive CPY Commands, Cobol Include, Copy Books Data File, RM/COBOL Development System Include, CryptaPix Encrypted.


The CPY file extension is utilized by a number of software applications. The application eCopy uses the CPY file extension as a Scanned Document, Atari Ramdrive uses it as a CPY Commands document, Cobol uses it as an Include file, Copy Books uses it as a Data File, RM/COBOL Development System uses it as an Include File, and CryptaPix as an Encrypted file.
The ECopy, when run, allows the user to work in a more efficient and faster manner with the created PDF files via document sharing.
It allows the user to easily combine, edit and capture documents that have been scanned; hence, the user's originally scanned documents will appear as any other electronic files.
When the file is run, it allows the sharing of digital copiers and scanners that easily convert paper-based documents into digital-type information.

Detailed information 

Category: Text files, Setting files, Developer files, Data files
File format: Proprietary
Open with Windows: eCopy, Atari, Cobol, Copy Books, RM/COBOL Development System, CryptaPix
Open with Linux: COBOL
Another familiar program using the CPY file extension is the Atari Ramdrive. The Ramdrive has 2 links, namely, the RAMDRIVE.CFG and RAMDRIVE.CPY. When the RAMDRIVE.CPY is run, it operates in the same manner as that with the RAMDRIVE.CFG file.
The file extension's most helpful function is the formatting of ramdrives.
The RAMDRIVE.CPY file enables the user to copy selected Atari files as well as format these selected files. The program however operates only on Atari 8-bit computers.



File type: Microsoft?s NET Application Configuration Information, CRiSP Harvest file, Rockbox Configuration File, WatchDirectory Task Information, Pro/ENGINEER configuration, DataFlex configuration file and the Delphi project configuration


The CONFIG file extension is most commonly used in program configuration files. The file extension is utilized for server processes, Operating System settings as well as user applications.

The .config file extension is used by various programs such as the Microsoft's NET Application primarily for the purpose of creating configurable applications. This file can be utilized by a number of applications with the NET framework as its basis.

The configuration application is most useful when there is a need to save a number of settings in just a single element; thus eliminating naming conflicts as well as making the work simpler when working with a number of configurations.

The .config file extension, when used by the application, is also helpful when the application has a reference to numerous DLLs that are able to read the configuration information. With the file extension, a Section Group can be set up to create a group consisting of two or more section elements.


Detailed information 


Category: Text files
File format: Proprietary
Open with Windows: Microsoft Outlook 98 Standard Edition, Microsoft?s NET, CRiSP, Rockbox, WatchDirectory, Pro/ENGINEER, DataFlex, Delphi
Open with Linux: CRiSP, Rockbox, WatchDirectory, Pro/ENGINEER, DataFlex, Delphi
Other programs that make use of the .config file extension include CRiSP as a Harvest file, Rockbox as a Configuration File, WatchDirectory as a Task Information file, Pro/ENGINEER and DataFlex as a configuration file, and Delphi as a project configuration file.
Usually, the file will have a similar root name with the application it refers to. For example, the file may present itself as exe.[resource ID].config. To identify the program using the file extension, the file's date and time as well as the location of the file can direct the user to what program actually created the file.

File type: Java Class


The CLASS file extension defines the Java program's functions as well as its variables. The CLASS file extension has a connection with the bytecode Java programming language programmed by Sun Microsystems.

The syntax used in the Java programming language is greatly influenced by C and C++; however, it has lesser low level facilities and uncomplicated object model.

When a source code file is compiled by a Java compiler, the latter will save the results in a CLASS file. The CLASS file could be subsequently loaded via the Java Virtual Machine. A number of software applications had been related to the CLASS file extension such as Classifieds Script, Turnkey Site, Classified Ads Secrets. ZipOffice 10 Classic, Software License Transfer- Class 1, Saver Pix-Class Chassies #1 and #2, Directory Classifier, PAD Service Classic and Foreign Language Game Collection (class-room).


Detailed information 

File format: Proprietary/Open Source
Open with Windows: Java virtual machine, Notepad, Classifieds Script, Turnkey Site, Classified Ads Secrets. ZipOffice 10 Classic, Software License Transfer- Class 1, Saver Pix-Class Chassies #1 and #2, Directory Classifier, PAD Service Classic, Foreign Language Game Collection
Open with Linux: Java virtual machine
When the user experiences a CLASS file extension error, this may be attributed to an incorrect program installed or a system error with its roots to the system registry.
Any user utilizing the CLASS file extension may experience problems related to the computer's performance and stability. Memory and CPU usage for the CLASS files may likewise be affected.

File type: CAJViewer Full-text database


What is

The CAJ file extension is a file created though the CAJViewer application. This application is similar to Adobe Acrobat. It also creates files similar to a word processing document; however, these files cannot be edited because they have image-like properties.

The files created and allowed to be read using the CAJViewer are limited to Chinese documents only. The CAJViewer application was made by the Tsinghua Tongfang Optical Disc Co., Ltd.

There are only a limited number of CAJViewer users, which are usually software informers. Just like other programs, CAJViewer has many versions but the most widely-used are the 7.0 and the 6.0. Sometimes, the CAJ file is associated with one of its executable files, the caj.exe. Other executable files of the CAJViewer are CAJVieweru.exe and CAJViewer.exe.

How to open CAJ Files

Category: N/A
File format: Proprietary
Open with Windows: CAJViewer
Open with Linux: N/A
Furthermore, the CAJ file created with the CAJViewer is similar to a PDF file. However, this file is formatted using the Chinese language only.
The CAJ files are commonly created, used, and distributed for academic purposes like academic journals or for schools and universities.
Chinese-based websites commonly use the CAJ file to share copyrighted documents.
Users can search for specific CAJ files in a CAJViewer database. However, just like the PDF file that can only be opened using the Adobe Acrobat Reader, the CAJ file can only be read using the CAJViewer application.
So far, there is no other application that can open CAJ files other than the CAJViewer.



File type: Canon Catalog Index

What is a CTG File extension

The CTG file extension is in the area of digital photography and video recording.

This particular format file is part of the Canon brand of digital cameras and recorders. There it serves as the representation for catalog index files created in the memory card of the device. And it normally resides within the folder CANONMSC.

Folder CanonMSC

The device in the memory card automatically creates this folder. It usually corresponds to other folders stored in the memory card used by the Canon devices. As a catalog, the CTG format file normally contains data on the number of images stored (or used to be stored) within the different folders created in the memory card.

The images commonly have a limit of 99 images associated with a catalog file. And anything that exceeds this number would prompt the creation of a new CTG format file.

One cannot open or edit this file manually. And it will be automatically deleted or erased by the camera device once the associated files are no longer present in the unit.

How to open CTG Files


Programs that can edit or convert this files.

Category: Miscellaneous File
File format: Proprietary
Open with Windows:
Open with Linux: N/A


Open with

  1. Search for the .ctg file in your device
  2. Double click on it
  3. Select open with option
  4. From the drop down list of apps and software select the viewer, app or program zoombrowser. If there is not any viewer installed you will have to download one of the programs we mentioned in the previous section.



  1. Open one of the nomedia viewers installed: zoombrowser from cannon
  2. From the application go to the menu of files to open the .ctg file from your device.
  3. Now you can view the format in the app.

The image Size

Compared with JPG image file formats, the CTG file extension is smaller in size but does not contain any image data which means that it cannot be transformed into any other image format.
Although closely identified with the Canon PowerShot digital camera series, this file format can also be utilized by other Canon photograph equipment. The bulk of the data contained in the catalog file primarily reference internal information associated with pictures taken with the camera and stored in its expanded memory. This proprietary format of the Canon application is also for an archive collaboration between the index files and the component data. Data streams are normally differentiated based on the recording timestamps attached to the image files logged into the catalog file.
When formatting the memory card directly from the camera device, the CTG format file will install in the storage device by the camera.
This is not the case when the user initiates the format operation using a Personal Computer machine.
Usually the creation of the catalog files is in a series of increments. These are based on the last data stored by the camera unit in its storage card.
Other canon file formats are CIFF, CRW and CR2.


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