Update issue #31 : Insert filters from DLL and AX files by drag and drop, file open or file menu most recently used list. Open DLL or AX files does not clean the existing graph unlike other file types.
Render media file on DLL or AX will still forcing attempting to render the file (like all other file types)

git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@367 c2f33eb2-41b2-391d-4cb4-d9d0608729ba