[b40d-48b2-979e]

IIRC PowerShell would convert your command's stream to your console encoding. I forget if this is according to how `chcp.com` was set or how `[Console]::OutputEncoding` was set (which is still a pain I feel in my bones for knowing today).

It's also not a file descriptor. It's a PowerShell Stream, of which there are five? you can redirect to that are similar to log levels.