I'm trying to upload 3gp files through wp-app.php, using rome-propono. This fails in a quite awkward manner. Namely, to store the file, wp-app does the following (cf http://trac.wordpress.org/browser/trunk/wp-app.php#L406 ):
$ext = preg_replace( '|.*/([a-z]+)|', '$1', $_SERVER['CONTENT_TYPE'] );
$slug = "$slug.$ext";
$file = wp_upload_bits( $slug, NULL, $bits);
In other words, it takes the second part of content type (e.g. image/jpeg -> jpeg), but only does so for content types with the letters a-z. On the 3gp content type video/3gpp, it manages to create a file with a slash in its name, and thus fails to save it. I have not investigated the ramifications for doing nasty stuff this way; I'd imagine they shouldn't do anything serious. Regardless...
If nothing else, this regexp should include content-types with numbers (and capitals?) to conform with the different content types available. Preferably, it should make note of the whitelist of mime types, instead of trusting the server. That seems consistent with the actions taken elsewhere, since not doing so would make later code fail for file formats with different extensions than content types.
