What is the Beta Vip_build- Beta?

I know this was the pre-release name for 1.6, however, I thought this went down with the release of 1.6.  Just because I opted in and had the game check files and it replaced 2 files, however, didn't notice any change with the exe file and version appeared the same.  I then opted back out and had it check files again.  I was just checking if this was the suggested 1.61 bug fix?