
This is almost certainly a MacBinary file which is an encoded version
of a mac file so the Resource fork and Data fork get preserved.
You need a program that converts this to a regular file. If this is a
macbinary file, you may have downloaded it in Text mode and is probably
corrupt (if you did). If you're using FTP to transfer it at any point make sure
you type "binary" first.

If you can open the file with a text editor and find
(This file must be converted with Bin....
at the top, it is a BinHex file and can be decoded with
BinHex 4.0 (among other programs).
