BTW, I have found that the files cannot be added to My Files (library or public shared) if they end in .sit, .dmg, etc., which should be a flaw or bug, since many files in Mac have such extension. Curiously, it is possible to add such very same files if they end in .sitx, .dmgx, etc.

On the other hand, with Gnutella port - Use Universal Plug 'n' Play (Recommended), sometimes WireShare connects as turbo-charged to five servers in just one minute, but other times it takes more and even much more (for instance, a whopping 26 minutes). Is there a way to improve that?

I'm glad you were able to resolve the issue you were having. You may need to enable sharing "Programs" for them to be added to your library. on the My files tab in Options there is a button to Configure unsafe sharing setting.