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What I have been calling "filters" vary by OS.

Prior to the LongHorn era that began with Windows Vista, XP and earlier had something called Column Handlers. See Creating Column Handlers.

Of...

I cringe to think of what anti-malware scanners would make of that guy's attempts to embed code within an MS Access MDB, ACCDB, etc. We also have no clue what he's doing but it is probably either...

The "DSO OLE Document Properties Reader 2.1" has a few quirks.

One of these is that for file types that don't have a Shell filter installed, or one that doesn't support a common Office document...

Maybe see Creating Shell Extension Handlers if this is a novel concept to you.

Normally this is done by a software vendor supporting their own custom document formats.

Most file formats do not allow for metadata like "Comments."

Those that do store it in different ways, and the Explorer Shell gets at them via registered Shell Extension Handler DLLs. Windows...