SWELL doesn't implement Windows' GetOpenFileName or GetSaveFileName. It provides BrowseForFiles instead.
Code:
/*
** GetOpenFileName() / GetSaveFileName()
** These are a different API because we didnt feel like reeimplimenting the full API.
** Extlist is something similar you'd pass getopenfilename,
** initialdir and initialfile are optional (and NULL means not set).
*/