Menu (Quattro Pro)
MU is a file extension for a definition file used with Quattro Pro for DOS. MU files contain menu definitions used by Quattro Pro. Quattro Pro is a spreadsheet application developed by Borland and later sold by Corel. MU files can be opened and edited with a text editor.
Learn more about .MU files:
Visit the Corel Web Site.
Find answers to your Spreadsheet questions at ITKnowledgeExchange.com.