What is .ACSM file extension?
File used by Adobe Digital Editions, a program used to manage and read eBooks as well as other digital publications; contains data to activate and download an eBook but does not contain the eBook itself; used to authorize, legally download, and read purchased eBooks in Digital Editions.
ACSM files are served to Digital Editions by Adobe Content Server. They can be opened directly in Digital Editions.
Most Digital Editions users will not encounter an ACSM file. If you do find an ACSM file, it most likely means that the download of your book was interrupted. You can double-click the ACSM file to resume the download and open the file in Digital Editions. The ACSM file will be located wherever your browser saves downloaded files.
NOTE: Even if you have a different eReader software other than Digital Editions, such as Kobo Desktop, you may still receive an ACSM file when downloading an eBook. However, you still must install Adobe Digital Editions to download the eBook and then it can be read and transferred to your eReader device.
You can see a list of software programs here on www.easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.