Could you clarify if you are trying to in that file, or if you are looking for a publicly available version of a piece that uses this naming convention?
It could refer to a specific draft of a "piece" of writing (like an essay or journalism) created on that date. 20-jan_3 - Google Drive
You might be looking for a recording or sheet music for a piece of music that someone shared with you under this filename. Could you clarify if you are trying to