[Inkscape-devel] File\Import not File\Open

My first post to this list, so bear with me. I'm trying to develop an extension to import svg data, a follow-up to Bug #179560. Question: is there any way to specify, inside an .inx file, that it is to be used only on the File|Import dialog and not in the File|Open dialog. My extension, if it works, will be meaningless in a File|Open dialog, because I only want to import one specific path node. Currently the list of available file types in the two different dialog boxes appears to be identical, is this deliberate or accidental?

Alvin Penner