I'm not trying to compress the folder "C:\Windows", but if the folder to be compressed is located in "C:", for example "C:\Data", this problem it may happen, that's why I advised you to using the module "ControlChars.Quote"

Oh Yep.. I have specified the same temp folder where they are the files arc.exe and arc.ini, but that does not mean that at the end of work must remove the files arc.exe & arc.ini, but only temporary files.