I used program to find duplicates, and while there are 25 files with same name and file patch but different FPK, there are tons of files with same name and size scattered in art.Some art files are duplicated on purpose though because it is the same model but linked with different textures and/or different animation files.
Some instances are just two different files with the same name too, where a rename should have been done but weren't.
Just mentioning it.
One needs to look at every duplication pairs on a case by case basis, to figure out if they are really duplicates or if they just appear to be duplicates.
Art that is unused (never referenced by XML or NIF or kf files) can be removed.
Identical art in two locations where two xml entries reference their own version can be optimized by making both reference the same and delete the now un-referenced duplicate.
etc.
So I guess you can't really merge FPKs without checking files first.
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