Glitch or not? Emulator Shalaeva3.4

I recently received this emulator. It’s good, it’s nice to work, but one thing came out :-(. I threw it off to my friend via modem and also a disk image I made. It contained a demo that flew recently, well, the one with the stop speed at the end,
Necron 64 and it was Conver Commander Kovalevsky version 6.1? I don’t remember exactly,
I don’t want to get into the disks, but it’s definitely version 6. Without a glitch when compacting.
So here’s the thing: when I launch it, it sees the files and starts,
but says that the disk is with an unknown format.

Alex.

but it says that the disk has an unknown format. I didn’t even pay attention to this. Who knows, everything is plowing! And the friend started it and said where are the files? There is a converter but it doesn’t show the files! The sheet fell out, everything was in place. But in Conver there are none! Today I took the emulator to work and held the disk image in my hand. And the same
history!!! But it seems that the file has not changed in any way! So why are they (the files)
there at first, but not after copying? Can someone explain?
With respect to All

Shor Kan.