I've tested your file.
There's a package information for original (compressed) file and the same for the file decompressed with decompress.exe:
Loading package: Museum_S2_Ch3c.upk Ver: 805/101 Engine: 7748 Names: 7070 Exports: 12538 Imports: 1846 Game: 8013
but there's file info for decompressed file you provided in archive:
Loading package: Museum_S2_Ch3c (unpacked).upk Ver: 805/101 Engine: 7748 Names: 7068 Exports: 12537 Imports: 1846 Game: 8013
As you can see, your package has 2 names less, 1 export less, and of course it has different file size. So, how did you obtain your "unpacked" file? It wasn't produced with my tool, or it was damaged after the decompression.
By the way, all files could be loaded into all my tools without problems, so it looks like main package structures was not damaged.
Like I said , the unpacked file is from original release of game ,they are same game , but GOTY version has all dlcs and patchs and also rebuilded.
So , somehow their files are compatible. When I found the file after decompression make game crash I try to replace the file with that "old version", and game works fine.So they are not unpacked from same file , but they have same data required by game.
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