I am a professional C and C++ software developer having more than 6 years of experience. I have worked on Windows and Linux operating systems.
The given requirement could be solved by leveraging the Windows tagging system. Windows already supports adding of tags like Author, Title, Comments, Subject etc (depending on file type - pdf, ppt, txt etc). I could work on this and provide a mechanism of introducing new/existing Windows property which you could use for tagging the required files. Once a file has a value for the property, it could be searched in the windows explorer using this tag.
Let's get in touch to discuss further details.