[KaktoR]

Have a look on data_pc\movie

a_pre1.usm (normal resolution)
a_pre1_2k.usm (2k resolution)
a_pre1_4k.usm (4k resolution)

Also for languages

*_F.usm (French)
*_G.usm (German)
*_J.usm (Japanese)

Others without a language letter are probably english ones.

Should you save a dozen of GB for one language and without 2k/4k movies, or just 2k or 4k movies.

Same for data_pc\id

*_F.dat (French)
*_G.dat (German)
*_J.dat (Japanese)

*_F.idd (French)
*_G.idd (German)
*_J.idd (Japanese)

And many more.

You can just use the search bar on explorer to find language related files: use *_F.*, *_G.* or *_J.*

But just move them to a backup directory just in case (you know).

Quick step: English only is ~7,2GB final size

!!! I have not tested if the game is working properly with missing language files !!!