You can not upload an image larger than 2mb period. That is unless you have access to edit php settings on the server. If you do not have a vds or dedicated server then you can not edit it. You can try asking your host to raise the max upload size
wmv uploads work fine if the extention is in the allowed types in gallery admin. I have a clean install of the gallery on a test site
http://omegatron.net/vbgallery/showimage.php?i=17&c=4