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This page will help you troubleshooting Star Wars Republic Commando. As this game was developed in 2003 and released for Windows XP times, it may be tricky sometimes to get it to run. By default, this game runs on every Windows(2000, XP, Vista, 7, Vista and 10). Anyway there are some criteria to fulfill.
Microsoft Visual C++ 2005 Redistributable (32 Bit)
Microsoft DirectX 9.0
Try to set the compatibility of SWRepublicCommando.exe to Windows XP SP3 and run it as admin.Create a shortcut of SWRepublicCommando.exe, open up the properties and add '-window -log' to the end of the commandline.
..\SWRepublicCommando.exe" -window -logThe log windows shows much more information which can be helpful.
Also open up SWRepublicCommando.log file with notepad and see what the crash caused.
When the game crashes after selecting new game, go to options menu and set bump mapping to low.