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#1
Yes, this can be changed, but I do not know, how this can be done without manually modifying the registry. Here we go:
Start regedit and go to:
HKEY_CLASSES_ROOT\SystemFileAssociations
There, find the file type you are interested in, for example .mp4
and add or change the value for "InfoTip".
The data you can use is explained here:
Windows Properties (Windows)
Well, it actually should do! Alphabetically it is located below all those "System.xxx" entries, directly below "System.Version" and above "SystemSettings".