I've noticed some strange things as well, but only with the 1080P versions for Singe2 (Cliffy, Fire & Ice, etc)
Everything plays fine, except that the video is slightly slower than the audio, and I can see the program trying to make it catch up at times. It is playable, but the moves can be off at times. I've tried re-indexing the mp4 files, re-downloading the whole game, etc. Certain parts of the game get bad- to the point the video is almost frozen for a couple seconds.
It also has the audio stuttering problem. I'm using win10, 6g ram. Intel I3. I've tried downloading an updated driver for the onboard audio (2-speaker HD audio device). Says I have the most current driver. Every other game plays fine on singe2, it's just the 1080p versions....
Any suggestions?
I will also try on my I7 rig as well and see if the problem is still there tomorrow.
Thanks for all of your hard work in preserving these games and memories!