you need to start regedit and go to:
HKEY_CLASSES_ROOT\SystemFileAssociations
and find what file type are you interested in, for example .mp3
and add or change regvalue "InfoTip".
data you can use are explained here:
Windows Properties (Windows)
you can add data for all file types at once not just for certain.
if you need more help let me know.
http://msdn.microsoft.com/en-us/library/ff518152%28v=VS.85%29.aspx


