The first thing I'd try is switching to the "beta" version for BtS. Outlined in here, ctrl-f "beta". That should at least sort out the crashing when trying to play with mods.
https://forums.civfanatics.com/threads/civ-iv-the-complete-edition-steam.671410/
Need more info to troubleshoot. What expansion/version are you using, are you using the Steam version, which mod folder are you installing into, are you modifying base game files?
You need to use windows visual studio to edit that, and then compile a new dll. That said I don't see why you need to make changes in the dll in the first place
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