- Only create the `session` directory if it doesn't exist (suppresses
"already exists" error from `mkdir`)
- Removes path delimiter conversion (paths now stay as `\` delimited)
- Quotes all `powershell` arguments to handle whitespace in paths (this
uses CMD syntax for `Command` and Powershell syntax for the remainder
of the line. This is because everything past the Command argument is
interpreted by Powershell, but not before or during the parsing of
`-Command` itself)
