Despite Office 2013 being over a decade old, search volume for this specific string persists for several reasons:
If you're confident about the source, here are possibilities for office2013.txt (unverified without viewing the file): bit.ly office2013.txt latest version
For the average home user, there is of Office 2013 from Microsoft anymore. Despite Office 2013 being over a decade old,
It looks like you’re searching for a text file (possibly containing a download link or product key) named office2013.txt hosted on bit.ly and related to the "latest version" of Office 2013. bit.ly office2013.txt latest version