FRD creates a VritualRoot folder in C: , what is it?

I ask this question because I'm searching a file which has been donwloaded, and find it in this path:
C:\VritualRoot\frd.exe\HarddiskVolume3\Downloads\FreeRapid\
But actually I store my donwloading files in E:\Downloads\FreeRapid\.
FRD always put the files to the correct path (e.g. E:), but is it an error, a bug or something else while it puts the files to the C:\VritualRoot\ ?
Because of performance, I really don't want extra files stored with system roots.

I think it's the sandbox system of an antivirus called comodo