Modding the inventory can be done by extracting mpq's, which is ez mode just time consuming. I couldn't find any resolution definitions in the mpq's so I'm assuming it's in the .dll's, probably d2gfx.dll.

I don't know how to find the location of the resolution in the .dll, or if it's even there. I've got mpq editing down fairly well but still new to .dll editing. When I disassemble d2gfx.dll there's ton of lines but I don't know how to associate a line with its function. Like I said, still new to the whole thing. If someone can give me a little help to get the game in 1280x1024, I'd be willing to put in the time to code the interface to properly work in that resolution, and then release it for everyone to use.