Below are the settings required to set up external tools in Visual Studio, and how to use Powershell to generate build numbers.

Visual Studio's External tools screen
Visual Studio External Tools

Create GUID

Item Value
Title Create &GUID
Command C:\Program Files\Microsoft Visual Studio\2022\Professional\Common7\Tools\guidgen.exe
Initial directory C:\Program Files\Microsoft Visual Studio\2022\Professional\Common7\Tools

Get Build Number

Item Value
Title Get Build Number (Today)
Command C:\Program Files\Microsoft Visual Studio\2022\Professional\Common7\Tools\guidgen.exe
Arguments [string]([int](Get-Date).Month) + ([string]((Get-Date).Day)).PadLeft(2,'0')

Get Build Revision

Item Value
Title Get Build Number (Today)
Command C:\Program Files\Microsoft Visual Studio\2022\Professional\Common7\Tools\guidgen.exe
Arguments [int](Get-Date).TimeOfDay.TotalMinutes