War3.mpq

Ppl can i be banned if I`ll edit or add some files in war3.mpq? KeyCraft did and some people were banned. And if I`ll use "Allow local files" will the result be the same?

I can't tell. I wouldn't do it. What do you want to do?
Ask Blizzard in the www.battle.net forum.

I just want to set my own font.

I believe that if you don't distribute the modified War3.mpq, it's allright to change the font.

If you have a modified War3.mpq, War3x.mpq, or War3patch.mpq, then you won't be able to log onto Battle.Net, so you can't be banned.
You won't banned for turning on the use of Local files.