Whitespace in theme files after uploading to server

After I download a file from the server using Filezilla and open it, I see that there are whitespaces everywhere, like this:

https://www.box.net/shared/b5b411349a5b8c3cb28b

I uploadet it like this:

https://www.box.net/shared/79f69768ea0902ff6462

Any ideas what’s going on?