Not exactly sure what you are thinking - but if I had a zip file on my desktop and I could run a command prompt to unzip the password protected file then I could probably do the same in a program. We use app_start to launch excel so why not some other program else to unzip a file.
My latest mantra - make sure you have latest stpapi patches and the latest session object. If on LN then please explore the option of using DAL2 functionality.
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