Humm...it donīt find my in use directory for Sh3. I guess that you know that a lot of ppl donīt use the game official installation directory. We have a lot of copies of a stock 1.4b SH3 to be used with different big mods, etc.
I guess that you get my point. Just make the tool ask for the "in use" Sh3 directory installation or make it get the menu_1024 file from the same directory that modMerge.js is. I guess that this last is the better because this way we can test/use any menu_1024 that we want before merge anything.
So, in truth i could not use it until now. No official Sh3 installation, but 5 "copies" with different big mods/stock here in my external HD!