Hello @nicholas_yue,
thank you for reaching out to us. You can find the crash reports of Cinema in its preference folder. The preference folder should be located in \{βββββββUSER}βββββββ\AppData\Roaming\MAXON\{ββββββββββββββVERSION}ββββββββββββββ\. It can also be opened via a button at the bottom of the preferences menu.
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However, this will lead you to the preference folder of the Cinema 4D app, not the one for commandline.exe. The last element in the path will be a folder with a name like S24_XXX_YYYYYYY where the XXX part is the minor revision and the YYYYYYY part a hash with no higher meaning for the user. So, the path is then for example {USER}\AppData\Roaming\MAXON\S24_037_DFA0E3FB. When you have run the command line app at least once, then there will also be a folder with almost the same path, but only that an _x has been appended, e.g., {USER}\AppData\Roaming\MAXON\S24_037_DFA0E3FB_x. This path then contains all the commandline.exe data, including the bug reports, which should be visible to you under {USER}\AppData\Roaming\MAXON\{VERSION}_x\_bugreports. For testing purposes, you can always invoke a crash on Cinema 4D by using the argument -crashtest. So, .\Commandline.exe -crashtest will force a crash which should pop up in your {USER}\AppData\Roaming\MAXON\{VERSION}_x\_bugreports.
Cheers,
Ferdinand