These extensions are diskette images, for the emulator function of floppy drive that have devices like Gotek, CosmosEx, etc. I do not work with disk images and what I do is convert them into simple directories with their files, using the Peter Putnik's excellent program:http://atari.8bitchip.info/floimgd.php
I copy the content of those images on hard disk, CF, Pendrive, SD, etc; even on real floppy disks.
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ST/fm/e, STacy, Mega ST/e, TT, Falcon, C-Lab MKX... and more music tools.