What are MS GUIDs and howto deal with them. (both on windows and unix/linux)
They look ugly like this {BFEAB774-C7DC-4032-B05A-DA5F7CB7B365} and are basically globally unique identifiers.
The MS msi installer uses a GUID to uniquely identify a software or module.
https://en.wikipedia.org/wiki/Windows_Installer
Tools to deal with GUIDs