Help! help! help!

As a beginner, trying to put together a site, the two questions I have are the following:

When working in Flashmx 2004, is it ok to publish it in a much earlier version. let’s say version 5.

Also, let’s say one published the site, but accidently deleted the html version of it, and is now unable to open the .fla file, but still has a working .swf file. Is it possible to retrieve .fla file.

Please lemme know ASAP.

Thanks a bunch.