Has anyone gotten the Timeslip mod to work? I'm trying to run fallout in windowed mode under vista and when I use the modified dll from the mod I get an error message saying the game must be played in Windows 95 or NT 4.0 or later.
Have you tried changing the compatibility mode of Fallout?
GOG.com sets Fallout to run in Compatibility mode 98/ME automatically, which is correct because it'll run better that way, but you could give it a try changing compatibility mode to 95 or setting it off. Right click the Fallout icon, Properties -> compatibility mode
If it doesn't help I can contact Timeslip and ask him about it