It's unknown to me what this tag is supposed to mean.
- Unrecognized hardware ("unknown device")?
- Default file editor, or file type associations ("unknown file types")?
- What is this file? ("unknown file")?
- WTF is this plastic part that came with my laptop?
If you knew it, you wouldn't be asking questions here. Seems pretty meta to me.
unknown software exceptionexception!
exception. Clearly someone's doing something wrong.