How i can i open this .prx file?

http://www.papajohn.org/Downloads/WMV-HD-1280x720.prx

i'm trying to make my videos HD with windows movie maker and this is the link to download the radio size or something.

i can't seem to open it/download/save it.

everytime i put open it says "the archive is either in unknown format or damaged."

it wont let me get it.How i can i open this .prx file?
Microsoft Windows Media Player



or check out this site for instructions:

http://forums.qj.net/psp-development-for鈥?/a>