STABLE version -- 5.1.1130.129

[piliq]

Have you checked their creation time?
They are used for components upgrade by Chromium.
They should be created by the beta version, 'c:\program files' is not used any more in stable version.

Yes. They were "fresh". I simply deleted them and disabled BITS service in Windows 7, and they are no more and no new folders.  But, there are still new "chrome_url_fetcher_..." folders in TEMP folder. Not a problem at all.

Are you using 64-bit browser?

Yes. I'm using now Version 5.1.1130.82 (Official Build) (64-bit) (Portable). Previous version was 5.0.1002.295 (Official Build) (64-bit) (Portable) and it works fine with Mega. No need in their App. I have to use Opera v95.0.4635.84 to work with Mega. Waiting for new version of Cent to use only one browser