You open crash logs with some ascii text editor such as notepad that comes with Windows. Or after upload here in the forum, click on the link to show the file content.
At the top, there is some general information about the crash and some version info. Below are info sections, one for each thread. The top thread, just below the header, is the thread that crashed. Ignore all the numbers and look at the dll file listing on the rightmost column. Look from top to bottom through the list of dll's in that section and check if there is a dll listed that resides in the plugin directory of OBS and if that is a dll you installed for a 3rd party plugin. In your case, it's win-capture-audio.dll, and this is a 3rd party plugin.
If you don't have browser sources, there is a dll list with full path info at the end of the crash log, so you don't need to actually search for a dll file on your system. However, if you do use browser sources, the crash log is truncated and the dll list at the end is omitted.