Current questions and answers regarding the map editor.

WinRAR can easily read Heroes game files with the .xdb extension and can even be used to edit them.

Hmm, it prompts me to open it with a program specifically designed for that file extension... But I don't rule anything out, as Far Manager has the same creator, and it opens both text files and RAR archives, so it's possible that WinRAR can do the same. But I would use a proven method.

I've been playing a campaign in Tribes of the East v3.1 for quite some time now, but I have the EWA v1.0 mod installed, and I'm wondering if it will work in the standard 3.1 version. I don't add any custom units or anything to the maps, but just in case, the mod is quite extensive...

You need to test it. I think it will work, but you'll have to adjust the balance significantly.