If you want a free program, you could try the open source Info-Zip software available at <http://www.ctan.org/tex-archive/tools/zip/info-zip/> for Mac, MS-DOS, Unix, Windows and just about everything else you might have.
Mac-users using Stuffit Expander may like to set a preference (File / Preferences / Cross Platform) to "Convert text files to Macintosh format . . . When a file is known to contain text". This gets rid of strange characters (linefeeds), which are not wanted on a Mac, at the beginnings of lines. MacZip is another free program for Macs. Mac users can also try ZipIt or other shareware programs available from the Info-Mac archives, e.g. from <ftp://mirrors.aol.com/pub/info-mac/_Compress_&_Translate/>.