Well, this has helped me getting videos in the campaigns of the HD-mod(before i had a similar error as discribed above, with scrolling texts but no pictures). However they dont play with music in the background now, like the usually did. Anyone else with that problem ? Or an idea on how to fix this ?
Use MMArchive from https://sites.google.com/site/sergroj/mm/
Extract files from SoD CD:
Open file Data/Video.vid and add files you extracted from Heroes3.vid.
Open file Data/Heroes3.snd and add files you extracted from Heroes3.snd.
Video & sound should work in AB and in SoD, but not in WoG (no sound). You need to disable CD check in your game .exe. Use any free hex editor like Tiny Hexer and do a search and replace for string:
You should get 2 replacements.