file name comparison

[mentalmushroom]

You can try a heuristic that takes an existing file name, changes its case and uses QFile::exists() to check if the filesystem treats the two names as the same file.

But as I said before file doesn't exist at the moment of comparison, therefore QFile::exists will not work, I suppose.

[squidge]

You can not do it easily because you do not know the underlying file system. Regardless of OS, it is the file system you need to be worried about. On both Windows and Linux, you can have file systems which are case sensitive and case-insensitive. An application can not easily detect the file system.