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Previously powershell.exe treated unknown arguments as a command line to execute. To align with POSIX so that things like shebang scripts work correctly, we are changing powershell.exe so that it treats unknown arguments (aka positional argument) as a file. This means that `powershell foo` will now attempt to use `foo` as a PowerShell script whereas previously `foo` would be treated as a command to execute. This doesn't affect existing usage of either -File nor -Command. Fixed tests that didn't explicitly use -Command parameter.