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the .img is a generic term. it is a binary file and if you don't know the filesystem they can be troublesome to mount. try this command when you are trying to mount an unknown filesystem:
sudo mount -t debugfs /path/to/file.img /tmp/mount/
if you can get it mounted then list the contents using:
after mounting sucessfully you can make a new file, format it with the filesystem you would like to use (cd's and dvd's use iso9660 format) and then copy the contents to it (obviously the files may need to be edited to make a dvd that you can pop in your dvd player)
if you can't get it mounted try opening the file with VLC (video lan client)
i have had success with this command... and even more success from learning how to read manuals (they almost have a 'syntax' of their own)
The IMG file format is one of the following files:
1. A CD or DVD image file, essentially equivalent to an ISO file. On such a file, simply changing the extension from IMG to ISO can make it usable as the latter by most programs.
2. An archive format used for creating a disk image of floppy disks and HDDs. This allows for digital storage, transmission, and replication of floppy disks and HDDs. Files created using this format typically use the ".IMG" file extension. There are different, incompatible image formats which use the .IMG extension.
3. A file in the Macintosh Disk Image format used by Aladdin Systems (now Allume Systems) ShrinkWrap and Apple Disk Copy for Mac OS although they share the same file extension.
4. The IMG file format, also known as GEM IMG, is an image file format used to store bitmap digital images on Graphical Environment Manager.
5. A graphics image format used in various ways by many different graphics software packages.
Still, I can put the .img file extension (or no file extension at all) on anything I wish.
People use the terms "image" & "imaging" alot & most of the time it refers to a byte for byte copy of a disk (HDD, HDD partition, CD, DVD, Flash, etc.).