I went into that file, found the
w_handle_upload function, and I see a sort of
switch statement, with extensions mapped to "MIME-types"
[whatever they are!]
I found the following entries.
'asf|asx|wax|wmv|wmx' => 'video/asf',
'avi' => 'video/avi',
'mov|qt' => 'video/quicktime',
'mpeg|mpg|mpe' => 'video/mpeg',
I atteempted to look up the mime-type for .3g2 files at this site,
but the mime-type entry was blank.
I think that .3g2 is a quicktime type, so I added into line 3 as follows:
'mov|qt|3g2' => 'video/quicktime',
Now I am able to upload fine. Thanks for the tip!