Zip Class no cross platform?

I have written an app that zips up multiple files for download by Win95-98 and Macintosh clients. The zip file created by the ZipOutputStream works fine when read by any of the PC programs but has serious issues when read by any of the Mac Compression programs. These Mac programs read zip files from PKZip and WinZip without any problems at all. There is usually a problem with the file header reported by the mac software, or problems with the slashes in directory names (Macs use ":" as the seperator.) A few shareware apps for Mac I have found will extract the files, but not without various warnings and work on the user's part. Anyone know of plans to make the ZipOutputStream more "standardized" or some work around to this? It seems a shame Java's class doesn't create a file as usable on the Mac as PKZip does, given Java's cross-platform mantra!

Jeff A. Moore
MCSE, MCP+Internet