-gamegrp [file.grp] stopped working

According to #266 it worked in the past (for non network folders).

But nowadays if DUKE3D.GRP is being put in the same folder of EDuke32 then there's no issue.

Yet if it's used via -gamegrp something\DUKE3D.GRP then it states "Found no recognized game data!". This happens with both absolute and relative folders.

runtime src|
0.0480s INFO| Started at 2024-10-24 20:47:15.611
0.0491s INFO| EDuke32 r10593-19c21b9ab
0.0499s INFO| Built Jul 25 2024 17:37:48, GCC 13.0.0, 64-bit
0.0508s INFO| Application parameters: -gamegrp ..\DUKE3D.GRP
0.0546s INFO| OS: Windows 10 (build 10.0.19045)
0.0562s INFO| Initializing SDL 2.30.4 (SDL-release-2.30.4-0-g92fe3b19c)
1.0102s INFO| Searching for game data...
1.0148s ERROR| Found no recognized game data!