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File type: Data File


File Extension MDF

MDF files are the DVD or CD data that is saved as an image using a disc authoring application, for example Alcohol 120%. These are very similar to the .ISO file format but are saved in a slightly different format or structure. In these files the actual data of the discs is stored within the MDF file itself whereas the track and header information is usually stored along with it in corresponding MDS format files.


Open MDF File

Category: Data File.
File format: Proprietary
Open with Windows: Microsoft SQL Server
Open with Linux:
MDF files are also the standard file formats used in the automotive industry in order to store measurement data. It has the raw measurement data which were gathered from the actual measurements as well as the metadata that is necessary to be able to interpret the raw data. MDF files are also the primary database format files that are used by the Microsoft product namely, Microsoft SQL Server. It is a high performance database manage system used by large enterprises for large volumes of data which is installed with the Microsoft SQL server as well as its related add-ons. In Microsoft SQL Server the users may also create custom MDF files.

File type: Keyhole Markup Language File

About the KML file type:

This is a XML-based specification for expressing geographical data, annotations and visualizations for 2D maps and 3D Earth browsers or geobrowsers. It is usually a set of KML files which contain the actual data for geographic locations in terms of a longitude and a latitude value along with other graphic images or overlay information files which are zipped together and distributed as KMZ files with the .kmz extension.
KML was originally created by a company named Keyhole, Inc which was then acquired by Google in 2004 for use with Keyhole Earth Viewer, later renamed by Google to Google Earth. KML files specify various features such as place marks, polygons, images, textual descriptions, 3D models, etc, for Google Earth, Mobile, Maps, or any other geobrowser which uses this standard. Each location is described in terms. KML has been adopted as an official OGC (Open Geospatial Consortium) standard as of April, 2008 recommended to be used with all geobrowsers.


Open KML File

Category: Data File.
File format: Open Standard.
Open with Windows: Google Earth, Blender (only import).
Open with Linux: Google Earth, Blender (only import).

File type: iTunes Cover Data Flow


These files contain the artwork for albums as well as the metadata of the songs that have artwork for their covers. These files are used and read by the iTunes software which is an Apple product, to speed up the browsing of the songs in the iTunes software in its Cover flow mode where it shows the thumbnails of the covers of the albums.

These files are saved by default by the iTunes application under the ~/Music/iTunes/Album Artwork/Local/ directory. These files are created, read, edited or modified by the iTunes software directly.

These are not meant to be opened and edited manually since it could corrupt the data in them and create problems.

The album artworks for the songs can be downloaded separately with your iTunes library by clicking on the 'Get Album Artwork' option from the Advanced menu within the iTunes application.


Detailed information 

Category: Data File.
File format: Proprietary.
Open with Windows: Apple iTunes
Open with Linux:

File type: 3D Image


These files contain 2D/3D vector graphics data and are based on Initial Graphics Exchange Specificate or IGES.

This format is used by several CAD programs. These files are standard text files and are used for saving the vector data of graphics and also for exporting them.

These files can be used to store wire frame models, solid object representations or surfaces, circuit diagrams as well as other such complex objects.

In the year 1979 the IGES format was first introduced and has since then become a common standard which is used commonly for transferring, storing and exporting three-dimensional models data between CAD applications.


Detailed information 

Category: Data File.
File format: Proprietary.
Open with Windows: Autodesk AutoCAD with IGES Import plug-in, Nemetschek VectorWorks, Cimmetry Systems AutoVue, Informative Graphics ModelPress Publisher or Reader, IMSI TurboCAD.
Open with Linux:

File type: Icon


ICO files are special image files that are used for icons in the windows operating system for various applications, shortcuts, folders and files.

These files have two bitmaps within them - AND bitmap which indicates the image mask and determines which part of the icon should be transparent; and XOR bitmap which contains the image of the icon, which is then mapped over the image's mask. These files can be modified in most graphical editing software applications such as Adobe Photoshop to create new custom icons which can be associated to different files or folders.

On web servers ICO files do not have much use except one very specific uses for a single icon file namely favicon.ico. This file is yet another icon file similar to the one described above but bears special meaning for the web server. It is generally placed in the root directory of the web server or the web application and needs to be mapped in the files of the web application by mapping a link to it in the header of the html files.

On doing so this icon will then appear on the user's browsers as an image representing the web site. Modern browsers such as the Internet Explorer 6.0 and above and Firefox show the icons of the web sites along with the title of the web sites.


Detailed information

Category: Image File.
File format: Proprietary.
Open with Windows: ACDSee Photo Manager, Adobe Photoshop, IconEdit2, SibCode Sib Icon Editor, IvanView, Referenced by the Windows operating system, Program4Pc PC Icon Editor
Open with Linux:

File type: Texture and Model


This file is required for the Thief Deadly Shadows game to run and contains the models and textures used by the game. It is installed in the system when the game is installed.


Detailed information 

Category: Data File
File format: Proprietary
Open with Windows: Deadly Shadows by Eidos Theif, Edit with the T3ed level editor
Open with Linux:

File type: Generic Printer Driver, CRISP (Geotechnical Modelling Software) "Front Squasher" (CRISPSQ) output file, Gameplay data , Grid Parameter Definition.


The files using the GPD file extension are typically accessed and utilized in Generic Printer Description files for Unidry minidrivers.

The files saved in the GPD file extension are programmed for the production of Unidry minidrivers. It defines the characteristics of the printer driver and consists of text-based GPD (Generic Printer Description).

The GPD files provide information to the Windows Printing Service on matters relating to the printing devices. When the unidriver-based print driver is run, the GPD file is usually integrated to the .bud file extension or a binary file that the spooler subsystem makes use of.

It may also have references to a PGD file.


Detailed information 

Category: Text files, Data files
File format: Proprietary
Open with Windows: Unidry minidrivers, CRISP (Geotechnical Modelling Software), "Front Squasher" (CRISPSQ)
Open with Linux: N/A
On Windows 2000 and later versions, three classes of printer devices are usually installed. One of these classes of printer devices is the Unidriver-based printer driver which was introduced by Microsoft Corp. to allow a simpler and easier way of producing and modifying safe printer drivers.
The driver uses the GPD file extension that identifies and explains all the capabilities of the printer. The GPD file extension is also used by the VISUAL EPR as an Input Data for PARAMS.EXE, CRISP (Geotechnical Modelling Software) or "Front Squasher" (CRISPSQ) as an output file, Gameplay data file and Grid as a Parameter Definition file.
The CRISP "Front Squasher" output file gets a GPR file and subsequently creates the GPD file.

File type: Family Tree


The FBC file extension is used with the FamilyTree Compressed Backup files. The files with the FBC file extension contain data on a family tree used by the genealogy application Family Tree Maker.
It is appended to all backup files of the Family Tree Maker. The said application allows users to create and share their family tree. The FTM or Family Tree Maker has been promoted as the top-selling and most patronized family tree software in the market.
Like other genealogy software application, FTM allows researchers to record all pieces of information gathered during the course of the research and to generate reports, books and charts that contain the said information.
Presently, the software is being offered to the users of computers running on the Operating Systems Microsoft Windows 98, ME, Vista, XP and 2000 only.
The manufacturer of the software has not yet made any announcements as to whether it is going to release it on other platforms. Majority of the features of the Family Tree Maker 2006, 2005 and 16 are capable of functioning with the Windows Vista. Although some features like exporting views, trees, or books to PDF still require updates.

Detailed information 

Category: Data Files
File format: Proprietary
Open with Windows: Family Tree Maker
Open with Linux: N/A
The Version 16 of the Family Tree Maker has been nominated for the 2007 CODiE Award under the category Best Consumer Productivity Solution.
The release of the redesigned Family Tree Maker 2008 in August of 2007 was received by the users with a lot of criticisms. Reportedly, there were missing features that had existed on the previous versions and there had also been reported data loss and performance problems.
A genealogy software application is employed in recording, organizing and publishing genealogical data. It could produce various text reports and graphical charts such as register reports, ahnentafel reports, and pedigree charts.



File type: eMusic File Format, Pro/Engineer


The EMP file extension is associated with the music files that have been downloaded from the download site The said files with the EMP file extension are then converted into the MP3 format by the download manager of eMusic. This online music store is known to operate by subscription and has currently more than 400,000 subscribers.

It is different from other known subscription music services such as Rhapsody and Napster in such a way that the downloadable music files are in the MP3 format which makes them completely compatible with every digital music player. The files are also free from the restrictions of the digital rights management software.

The restrictions include burning or copying limitations or expiration dates. Although the online music store has been lauded by the public, its low-price model and lack of DRM or digital rights management encoding have made big record labels frown upon its services making it specialize in non-mainstream music genres and underground artists.

Among its non-mainstream music are pop, jazz, new age, traditional music, underground rap, indie rock, hardcore punk, classical music, experimental music, and electronic which are all on independent record labels.


Detailed information 

Category: Audio Files, 3D Image Files
File format: Proprietary/ Open-source
Open with Windows: Apple iTunes, Microsoft Windows Media Player, Nullsoft Winamp, VideoLAN VLC media player, Roxio Easy Media Creator, Other music player, Pro/Engineer
Open with Linux: VideoLAN VLC media player, XMMS, Amarok, Pro/Engineer
The EMP file extension is also affiliated with the 3D modeling software Pro/Engineer which is generally referred to as ProE or Pro/E. This 3D CAD parametric feature solid modeling software was developed by Parametric Technology Corporation or PTC. Among its direct competitors are CATIA, Autodesk Inventor, Solid Edge, SolidWorks, and UGS-NX. The software runs on a number of UNIX flavors, Microsoft Windows and Linux and provides mechanical engineers with a solid modeling, drafting and assembly modeling functionalities.

File type: Outlook Express Email Message


The EMAIL files are frequently categorized as Text Files. They are the email messages which had been created using the MS Outlook Express. In order to open the said files, users would have to employ either the MS Outlook Express or a text editor. The EMAIL files may also be possibly imported into various email clients.

The files are frequently known as an alternative extension to the EML files which could become infected by viruses. Users would have to be very careful when opening the said files.


Detailed information 

Category: Text Files
File format: Proprietary
Open with Windows: Microsoft Outlook Express
Open with Linux: Microsoft Outlook Express
The EMAIL file extension is used in identifying Outlook Express Mail Message files. Outlook Express is an email client bundled with the Internet Explorer versions 4.0 to 6.0. It is also bundled with a number of versions of the Microsoft Windows.
In the Windows Vista, the Outlook Express is substituted with the Windows Mail. Windows Live Mail has been released as a successor of the Windows Mail and Outlook Express.
The Outlook Express is different from the application Microsoft Office Outlook email client that ships with Microsoft Office for Windows. Both programs have no common codebase but have the same architectural philosophy.
The similarity in the names has mislead a number of people in incorrectly concluding that the Outlook Express is the stripped down version of the Microsoft Office Outlook.
The Outlook Express employs a Windows Address Book in storing contact information and has a tight integration with it. In the Windows XP, it is also integrated with the Windows Messenger.
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