Sometimes you may come across files that have weird extensions .img and .ima are couple of them, first of these files may not be regular image files, but actually image copies of a drive or folder.
According to Wikipedia a IMG file format can be any of these things;
- 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.
- 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.
- A file in the Macintosh Disk Image format.
- A graphics image format used in various ways by many different graphics software packages.
To open a .img or .ima file or mount it as a virtual drive you can use a software called Magic Disc, you can learn about how you can mount img files in this tutorial on mounting ISO files as a virtual drive, though the tutorial talks about ISO files, .img and .ima files can also be mounted in a similar way.