What Is an ACSM File?
An Adobe Content Server Message (.ACSM) file is a file that has the.ACSM extension. Adobe Digital Editions uses it to activate and download Adobe DRM-protected content.
ACSM files don’t count as eBooks in the usual sense. They can’t be read ACSM file opened or like other eBook formats like an EPUB, PDF. The ACSM file is simply information that Adobe sends. The ACSM file does not contain an eBook. There is no way to extract it from the ACSM.
ACSM files instead contain data from Adobe Content Server. This is used to authorize that the book was legally purchased. The real eBook file can then be downloaded to your computer using the Adobe Digital Editions program and read back on any of your devices. To access ACSM files, you must use the ACSM Readers apps
This means that once your device has been properly configured, you can open an ACSM File to register the book to the ID that you have configured Adobe Digital Editions with. You can then read the book from any device running ADE with the same ID without the need to repurchase it. You can find more information about this process below.
How to Open ACSM Files
Adobe Digital Editions allows you to open ACSM files on Windows and macOS as well as Android and iOS devices. The same book can be downloaded to multiple devices using Adobe Digital Editions with the same user ID.
To connect your eBook vendor account with Adobe Digital Editions, use the Help > Authorize Computer menu item in Adobe Digital Editions. This will provision your books for other devices so that they can be re-downloadable in the event that your device fails or the book is deleted. You don’t need to purchase the book again.
You can access Adobe DRM-protected information through the account that you created on that authorization screen.
How to Convert an ACSM File
An ACSM file cannot be converted into an eBook format such as PDF, EPUB, or another. The ACSM file is a text file that describes the steps to downloading the actual eBook. This could be a PDF or EPUB.
Still Can’t Open Your File?
It’s different from other file formats so if your ACSM file isn’t opening, look into the errors. If you get an authentication error when opening the eBook, it’s likely that you are not logged in using the same ID as the purchase or that you don’t have ADE installed.
If you have tried everything and the file doesn’t open, please double-check that the extension is actually “ACSM”. While some file formats may use the same file extension as ACSM, others are different and require different programs.