If mednaffe.exe is located in a directory whose path contains "bin" or "lib", mednafen.cfg cannot be found (even if in the same folder as mednaffe.exe).
For eg.
if the path for mednaffe.exe is D:\bin\mednaffe\mednaffe.exe
and the path for mednafen.cfg is D:\bin\mednaffe\mednafen.cfg,
(same directory)
mednafen.cfg will still not be found. This is true for "lib" as well.
If mednaffe.exe is located in a directory whose path contains "bin" or "lib", mednafen.cfg cannot be found (even if in the same folder as mednaffe.exe).
For eg. if the path for mednaffe.exe is D:\bin\mednaffe\mednaffe.exe and the path for mednafen.cfg is D:\bin\mednaffe\mednafen.cfg, (same directory) mednafen.cfg will still not be found. This is true for "lib" as well.