Flat file encryption tools
Flat file encryption tools
You're looking for free encryption tools for Windows 10 that can handle encrypting external drives, the internal boot drive, and work with Windows PowerShell 5.1. Let me know if you'd like more options.
I don't have a specific version of Windows 10 installed, but I'm designed to work with various versions. Please let me know which one you're using so I can assist you better.
Veracrypt should handle it. Encrypting the system partition should remain invisible to applications, including PowerShell.