I see two possibilities:
either this game uses some encoding for text that doesn't have the alphabet in continuous order (ie, ebcdic) or it's a multibyte format other than UTF-16-LE.

both are scary

it could also be that it doesn't store text in RAM (like, it just loads it out of the datafiles and immediately renders it to textures) and the datafiles are compressed/encrypted.
I did find a partial font in the main binary. it has no roman characters.
which is worrying because this is the english version
ahh yes, the TransReport.
And TransToEE.
"Are you FTM or MTF?" "I'm TTEE, Trans To Electrical Engineer"
noclip.website/extractor.ts at 326ed788b286d5437ef0bd640a010b921b408f98 · magcius/noclip.website

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wow, even with this encoding, I can't find any matches in the datafiles OR ram!
ahh. I bet it's just dumping straight to textures/indexes in RAM, and the datafiles are compressed. of course.
it's a very simple RLE system bit it seems it adjusts the encoding on a per-file basis, so that some files have more lookbehind and some have less.
and I think it's doing that optical-media-console trick of having a main binary that's looked up using the filesystem, which has an index compiled into it that says what sectors the datafiles are in. So you only ever need to do one filesystem lookup
it uses 28bit filesizes?
with flags in the lower 4 bits?
@foone 🤔 I have a data file format that's like 48bit for file size verification and another 16 bit for file reader extension flags...
@foone My favourite order to encode text is in the order each character became necessary as I built the game.

@foone

S,C,O,R,E,G,A,M,V,Y,U,W,I,N

@Farbs @foone yeah! I'm doing this right now with a little NES game. I'm awarding myself bonus points for including the health symbols between the letters 

@Farbs AHHHHHHHHHHHHHHHHHHH I hate that.

especially when it ends up they never needed some letters so they're just missing in the font
(I'M LOOKING AT YOU, SONIC THE HEDGEHOG)

@foone not sure if Trns stands for Trans or Trains in that list