is it possible to patch a zip file?

[GepperRankins]

i want to make a micro mod for battlefield 2 that puts grid references on the maps. the thing is the maps are image files about 150K each but they're in .zip about 50MB each.

is it possible to make an installer that updates just these files without people having to navigate through 12 zip files and do the backups and replacements themselves?

[{I}{K}{E}]

http://www.chilkatsoft.com/ChilkatSfx.asp

[GepperRankins]

but i want it to unextract