.Del files in " C:\virtualroot

[Guest]

[DrAlrek]

i've been using comodo firewall for awhile, and about 4 mouths ago i started using the "always sandbox" menu for all of my programs that access the internet, (my 2 web browsers, skype, utorrent and other things like that). i have found HUNDREDS of files in the folder that D+ uses to virtualize applications with the ".del" extention. i googled that file extension and all i could find out was that it was "deleted data" the .del files show up in every time i download anything with dragon, firefox and skype, (in almost every folder of each directory) but never in utorrent's folder in virtualroot 

my question is as follows : why do those files keep showing up?

with a sense of hope for a solution,
- DrAlrek

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