If you're not using a Mac, tough luck. If you are, or have access to
one, use DropStuff for Mac or BinHex (with deBinHexing extension),
both available as shareware for numerous Web sites. If you can't be
bothered, and it is an e-mail attachment, ask the sender to send it
as a PC-formatted file, UUencoded (which is a safer bet than
AppleDouble or MIME format).
-- MFL