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This might be a problem with how you named your files.

If there are some non-latin letters symbols - this might be the case.

The fact of the matter is that the name of all my files, I point to latin letters symbols, because I read above that many had problems with this. From the very beginning I took this fact into account and was attentive to it.

I don't know then.

Packing might be problematic at some point, but so far it was working without any troubles.

If you really want to pack your game but it just doesn't work, you can use EnigmaVM to pack your files and then use it with packed EXE.
There should be a  manual for that on their site.

Thank you very much for your help! It probably won't help, but I'll try!