I think flashp.exe was running in sandbox.
ResetSandbox would have deleted it.
You tried ResetSandbox after running it from VTRoot folder.
And running it from VT folder, it was not sandboxed.
I think thats why ResetSandbox didn't deleted it.
Files running from VT folder were not sandboxed.
Dont know if its by design or a bug?
I think its a dangerous bug.