I'm looking for a lightweight, personal document management system to enhance Windows File Explorer. I prefer something open source, .NET-based (or rather, not Java-based) that isn't dependent on IIS--so not web-based, and free. File-based storage, rather than reliance on a DBMS, is also preferred.
My minimal requirements are document versioning, the ability to define custom metadata fields, and search of both metadata and document text (Word, PDF, txt).
I also need to handle non-textual document types such as images, Excel files, binaries, etc.
Shell integration with Windows file explorer (as per OneDrive) and even Office would be nice.
Anything else would be superfluous--i.e. I'm not after SharePoint.
Ease of use is important so GUI... but would consider command line if nothing better exists.