Resolve absolute path from relative path and/or file name

Question

Is there a way in a Windows batch script to return an absolute path from a value containing a filename and/or relative path?

Given:

Answer 1

PowerShell is pretty common these days so I use it often as a quick way to invoke C# since that has functions for pretty much everything:

@echo off
set pathToResolve=%~dp0\..\SomeFile.txt
for /f "delims=" %%a in ('powershell -Command "[System.IO.Path]::GetFullPath( '%projectDirMc%' )"') do @set resolvedPath=%%a

echo Resolved path: %resolvedPath%

It's a bit slow, but the functionality gained is hard to beat unless without resorting to an actual scripting language.