From the Official Site (
http://www.interplay.com/fallout/faq.html):
How can I install to WinNT?
NT users can get around the installer by manually installing the game themselves. Note however that you must have at least NT 4.0 with Service Pack 3 in order to play the game. Also, Fallout should work fine but was not tested very much under NT.
For the instructions below, I will assume that you have created a folder called FALLOUT on your C: drive and that the drive the Fallout CD is in is your D: drive. Insert your actual drive letters where appropriate.
1. Copy d:\program\win\falloutw.___ to c:\fallout\falloutw.exe.
2. Create a text file in c:\fallout called fallout.cfg and add the following line to it:
[system]
3. You now have 4 options corresponding to the 4 install sizes:
3a. Do not copy anything else. This is the same as the smallest install, but is also the slowest way to play the game. If you do this, make sure you follow the steps in 3b, 3c & 3d below for editing the config file.
3b. Copy d:\master.dat to c:\fallout\master.dat. This file is 318 MB.
If you do _not_ do this step, add the following on the next line in c:\fallout\fallout.cfg:
master_dat=d:\master.dat
3c. Copy d:\critter.dat to c:\fallout\critter.dat. This file is 150 MB.
If you do _not_ do this step, add the following on the next line in c:\fallout\fallout.cfg:
critter_dat=d:\critter.dat
3d. Copy the entire d:\data folder to c:\fallout\data. This is 73 MB.
If you do _not_ do this step, add the following two lines to c:\fallout\fallout.cfg:
[sound]
music_path2=d:\data\sound\music
4. Add the following line to your [system] block:
free_space=0
5. Make sure you close and save your changes to the c:\fallout\fallout.cfg file.
For example, if you chose to not copy any of the data files over, you should have a fallout.cfg file that looks like this:
[system]
master_dat=d:\master.dat
critter_dat=d:\critter.dat
free_space=0
[sound]
music_path2=d:\data\sound\music
That should be it! Just run c:\fallout\falloutw.exe to play the game.