A file having .ACSM file extension is an Adobe Content Server Message file. Adobe Digital Editions (ADE) uses this format to download and activate Adobe DRM protected content.
Not like standard Ebook Files
It is crucial to know that ACSM files in the regular sense are not standard eBook files. They can't be opened and read the same as the other eBook formats such as PDF.
The ACSM file has information communicating with Adobe servers. There is no eBook locked, nor there is anything to extract from the ACSM file the book.
Instead, the ACSM files containing the data can be downloaded as it has the authority that the book is purchased legally. You can download The eBook through the Adobe Digital Editions program. You can use the same software, and it can be read in any of your devices.
How to open an ACSM File
Precisely, once your device is set up properly, you can open the ACSM file so that you register the book to the Adobe Digital Editions configured ID, and then to read the book-running ADE on any device.
You can do this using the same user ID, and there is no need to repurchase it.
Adobe Digital Editions are employed to open ACSM files on Windows, Android, macOS, and iOS devices. When you download the book on a device, you can download it in any other device with the same user ID.
Use the free version of Adobe Digital Edition.
You can download it from here: http://www.adobe.com/products/digitaleditions/?PID=3081440
There may be a need to install Norton Security Scan or any other program during the ADE setup.
These programs may necessarily not be related, so you can opt-out, but be careful to watch during the installation for that option.
Use the Help > Authorize Computer menu in Adobe Digital Editions so that you connect to the Adobe Digital Editions, your eBook vendor account.
In this way, you can assure your books are available on other devices as re-downloadable. You can do that even if your device fails. Or if you delete the book. Thus, you don't have to buy the book to read on other devices.
You can read the protected Adobe DRM data through the account on the authorization screen. It also means you can open on other computers and devices the same ACSM file with the same user ID.
You can authorize the computer without ID by checking in the correct box through the Authorize Your Computer screen.
How to Convert an ACSM File to PDF
As the ACSM file is not an eBook, you cannot convert it to another eBook format. The ACSM file is a simple text file describing how to download a real eBook. It may be a PDF, etc.
As there is DRM protection, converting the actual eBook file into a new format is impossible.
Thus, find the file downloaded using Adobe Digital Editions. You can use a file converter program to pdf to open it such that it supports the book format such as
From there, convert as per your needs into a suitable format. So that you use the eBook on the Kindle device.
You can find the ADE downloaded book by right-clicking in Adobe Digital Editions on the book and choosing Show File in Explorer. Mostly, in Windows, it will be as:
C:\Users\[username]\Documents\My Digital Editions\ folder.