I am getting the same error for the GOTY edition. I am using US/ English fonts. Edit. I just tried it with out the modernizer file added and I still get the error.
Viewing post in No One Lives Forever 1 - Modernizer comments
hi, im also having this issue and i can post my own debug file
-- Hello World, We're all set here. Enjoy the show!
Hooked window!
Initialized interface\fonts\font_help.pcx
Initialized interface\fonts\font_small_0.pcx
Initialized interface\fonts\font_med_0.pcx
Initialized interface\fonts\font_large_0.pcx
Initialized interface\fonts\font_large_0_hd.pcx
Initialized interface\fonts\font_title.pcx
Initialized interface\fonts\MsgFontFore.pcx
Initialized interface\fonts\NumberFontFore.pcx
Cannot load font: interface\fonts\font_air.pcx
Cache Miss for <945350828>
Invalid window proc call <144>, ignoring
Invalid window proc call <2>, ignoring
Invalid window proc call <130>, ignoring
Edit: I currently don't have any other language set on my PC besides english