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One way for debugging a game crash on native level is by using Debug_executable_of_SWRC, which is a modified executable which shows the stacktrace of the crash.
Just put the executable in system folder and run it. Don't forget to turn bump mapping to low if the games crashes after loading. Now enter 'debug crash' in console and you will get a detailed stacktrace why the game crashed.
An alternative for debugging is running the executable in OllyDBG which allows you to see and modify the game runtime on Assembly level.
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