If I am editing a file in GVIM and for agurgument sakes the file is a XML file with the extension ".xml", and I click "File > Open" ... GVIM will filter by files of type ".xml" which is fairly annoying.
It is annoying because often I have files which do not have the appropriate extension for the type of content they contain, which means that when I want to open another file I have to change the filtering every time.
So either getting rid of this filtering or adding extensions for a file type would be great :)
