This is not that difficult in principle using VBA . You just grab a handy
passing programmer to write a macro which auto-executes on saving a
document. Or you buy it in.
See for example - http://www.cdev.co.uk/metadata.htm or do an internet
search for something like "vba document properties"
The tricky bit is not saving the metadata automatically in the document
properties but making sure it is present to be saved. Not too bad for name
as it can extract that for the system, but once you start talking about
subject or more esoteric custom metadata either someone has to supply it
somewhere or you rely on unreliable tools to generate it based on content.
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