the DMK will probably work in TRSTools, so you can copy the files to a temporary directory, then open a blank DSK and copy the files to that. It may very well work, so go ahead and try it. If it does come in DMK only, all is not lost. All the DSK's I downloaded worked without an issue, though, so if something comes in multiple formats, always pick the DSK. However, while SDLTRS does support DMK, I noticed that a lot of them were larger than the 166k floppy drives that the emulated machine supported, so it was hit-or-miss as to whether these worked out of the box. DSK and DMK are two virtual disk image formats, so either of these are potentially usable in SDLTRS. There are two ways to do this, which I'll discuss below. COM means that it's actually going to come as a binary program, not a disk image, so you'll need to copy it to a disk image to run it. Second, disks will be labeled as either of type COM, DSK, or DMK. I just got the last of the Montezuma Micro CP/M boot disks, and that's what I used. First, you don't need every CP/M boot disk that's out there. Now before you hop out to that site and start downloading everything like I did, you may want to pause a bit to avoid some mistakes I made.