Plugin Author
Rinat
(@rinatkhaziev)
By default the plugin allows uploading all files that WP allows to upload: http://codex.wordpress.org/Uploading_Files
Unless you have some knowledge of PHP I suggest you to leave it as is and just delete wrong files from Manage UGC tab in Media in dashboard.
pretty simple actually
open frontend-uploaded.php
find
$this->allowed_mime_types = $this->_get_mime_types();
replace with
$filetypes=Array ( "jpg|jpeg|jpe" => "image/jpeg",'gif' => "image/gif", "png" => "image/png", "bmp" => "image/bmp");
$this->allowed_mime_types = $filetypes;
you can add whatever mimetypes you want.
http://www.freeformatter.com/mime-types-list.html#mime-types-list
