Well, the patch for the game (realMyst), seems to check the installed files for size.... I was using a no-cd patch on the game, so the size is different. I can't reinstall because my original disc got shattered (why i used the nocd), so all I have left is the files that were installed to my computer... I should have saved a copy of the original files, but i guess i forgot. At any rate it would be nice to just extract the patch files and get around the file size check...
BTW I would just buy the game again instead of going through this trouble, but I originally bought it for about $30 and now ,since it is no longer being produced, i'd have to buy a used copy for anywhere between $50-$70.
Also, there's been a couple times when i've tried to put some drivers onto a floppy, and the whole driver setup program was too large to fit on one... The drivers were locked in very similar looking cab files, and I came to this same stumbling block...