icasefile does not function properly on modern GNU/Linux systems.
icasefile is LD_PRELOADable wrapper for several libc functions such as
open(), stat() and chown(). It allows user to access files regardless of
filename case, just like it would be possible with case-insensitive filesystem.
This can be helpful with games ported from DOS/Windows to GNU/Linux with
datafiles extracted from original source. This can be true for mods as well;
Cave Story mods come with files that may or may not have matching references in
other parts of the mod.
Each (supported) system function will first check if the requested file can be
found as-is. If the filename contains one or more directories, file (and
subdirectories) are searched from each directory. In short, this allows
music.dat to match MUSIC.DAT and ../Data/INTERFACE/ui.DLG to match
../data/interface/ui.dlg.
Usage: LD_PRELOAD=/path/to/icasefile.so APPLICATION
If you don’t know how to compile or use it, either you don’t need or want this.