I'm not sure but I suspect you do.
Try the TTConverter or TTFontConvert at;
I received some fonts in an email from a Mac user. He attached them as windows friendly attachments, uncompressed. When I add the windows extension (TTF) windows still doesn't seem to recognize them.
I wanted to set the file to open with Windows font viewer, thats what my other fonts open with, but I can't seem to find it on my computer.
Thanks for your help!