changing file types

[nanook]

i made a booboo.
i was in winmx this morning and went to rename a file and somehow, mistakingly, changed the file type.
it is now listed as a "mpe".
and will not refresh in my "shared files".
yep.............i'm a dork.

so now it won't list in my "shared files" either.

so how do i change this????

it's not a big-biggie, but it would be nice to know.

thanks