I am a full Linux system.
I have both MS Excel and Libre Office installed. Yes, it could be the programs fighting, but I do not think so as I uninstalled one and reinstalled the other and vice versa, in an attempt to find out which if either was causing the Parser error on incoming and outgoing documents. Problem remains no matter which program I use.
Not new to using Excel. New to parser error on incoming and outgoing .xcl documents. Looked up meaning, deals with formatting of sheet/pages. Reformatted document, still have problem.
I've tried what I know. What do you know that I don't know?