As long as you extract ( decompress ) all the compressed files that make up your solution, you should be able to send your files out as a compressed archive.
If all else fails, you could try an FTP service such as YouSendIt to email them a download link from which they can download your trial solution.
For whatever reason, they won't open after being compressed and decompressed.
I don't know if this is a Win 7 to Win XP thing or what. It's been quite frustrating since the client has been waiting for examples.
I may just forget that whole idea and either mail them a CD with the folder or try the FTP thing as well (although I don't want to make it to technical).
Are you by any chance using FileMaker 11v1 instead of 11v2 or 11v3?
There was an issue with getting runtimes to work on windows systems with 11v1 that the 11v2 updater fixed.