If you Google Flash swz you should find plenty of info to explain what it involves.
Ok... So I've read up on Flex & RSL libraries. I've also established that RSLs are not beneficial to my application.
Up next I guess I'll go Google
i) The conditions that prompt Flash to generate a swz.
ii) How I can deactivate the generation of this swz within Flash.
Found my answers on these sites:
To disable external run-time libraries, you need to access [file\publish settings],
Proceed to the actionscript settings (click the small spanner) on the publish settings panel,
click on your preloader method (textLatour.swc in my files for some reason),
double-click on Link Type (look for the chain icon), disable [use default shared library linkage] and
switch Link type to [merged into code].