LucasArts posted me this not official solution for X-Wing Collectors Series & Trilogy (X-Wing 95 & TIE Fighter 95. Maybe X-Wing vs TIE Fighter too):
"I have received reports from customers who were able to run this game on a Windows 2000 system. To get the game to run, ddhelp.exe was added to the Windows\System32 folder of Windows 2000. The file is available in the
Direct X folder of the game CD. Insert the first game disc. Explore the CD for the Direct X folder. Copy the ddhelp.exe from this folder to the Windows\system32 folder of Windows 2000."
Anyone could verify? Post your result here please.