You can get some original files from the Fable disks.
Go to My Computer, right click the drive that the disk is in,
click Explore, right click the zip file(Disk1C~1)[or 2,3,4].
You should be given the option to "Extract to", now you need
to set it to extract to a folder in My Documents or somewhere.
Once this is done you can open the folder and find the file you
need. Highlight that file and copy it to the original location.
Which files are on which disk is here:

Disk 1
game.bin
names.bin
script.bin
text.big

Disk 2
finalalbion.wad

Disk 3
effects.big
graphics.big

Disk 4
textures.big