Hello.
I got this problem which has bothered me for ages.
When i try to edit files from Tileset, it doesnt work.
What i do is:
Find the file i want to replace and copy its treepath,
then i find the new file, extract it somewhere on my computer,
and then i open it in MWCS (at my patch-3.mpq) by using the treepath i copied earlier. Then i save and close archieve.
Works for objects, but not for this :S
Thanks, Gorgeman