Menu Item what does %U or %F mean

[pgmer6809]

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I am creating a new menu item in cinnamon. Pretty straight forward to give the item a name, an icon and so forth.
When it comes to the command, I can enter eg.

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/usr/bin/progname

but I notice that other programs such as xed often have a %U in this field. Some other programs eg GVim have -f %F.
Where is the documentation on what %U and %F do? and are there other options as well?
the man page on dconf-editor does not seem very helpful, nor does the man page on gsettings.

[t42]

It is an argument to the Exec key
%u is a list of URLs or file paths. Each URL is passed as a separate argument to the application.
%f is a single file name (or file path), even if multiple selections are made
see Desktop entry keys