A launcher was created on the desktop, and the tooltip does not display what was put inside the comment field. Instead, the tooltip displays the info about the file type, size, and date modified.
Created attachment 4245 Comments in .desktop files are displayed in the tooltip This patch prepends the Comments to the tooltip. Hopefully that makes it stand out. Let me know if there's any issues.
Added to eric/bugzilla-patches branch for testing. http://git.xfce.org/xfce/xfdesktop/commit/?h=eric/bugzilla-patches&id=2fac2c92ccb2fec0d6b64aa97c1f2315836d3ab1
Committed to Master: http://git.xfce.org/xfce/xfdesktop/commit/?id=2fac2c92ccb2fec0d6b64aa97c1f2315836d3ab1