AFAIK, the development version of sfxr pulls in the whole GTK+ stack just to display a file dialog boxes.

Since the interface for the dialog boxes is clearly defined (FileSelectorLoad and FileSelectorSave), it should be trivial to create a separate 'fileselector.cpp' file for Windows and Unix systems that defines the used methods.

This would be great. I have some code for simple directory access, so I might slap this together.

The file selection does not use GTK anymore and should be good enough for now.