I'm with you, and not just from a "human" perspective. Also when writing small programs meant to be relatively lean/simple it can be a problem when the user expects it to find a particular file regardless of its case (will it be DOOM.WAD or doom.wad? Doom.wad? Doom.WAD? ... guess it'll have to be [Dd][Oo][Oo][Mm].[Ww][Aa][Dd] and import some globbing library as extra dependency... that, or list the whole directory regardless its size and lower/upper every single filename until you find a matching one...)