Just a heads up, I have noticed the inventory scanner is no longer processing .MINI files after upgrading to 2017.3 (including 2017.3_SU1). You will need to rename the .MINI files to .MINISCN for them to be processed. Pretty big oversight I think, and hopefully it gets patched soon.
My endpoint clients are still 2016.3, and I am assuming that 2017.x sends the new extensions. We will eventually begin rolling out the new agents system-wide, we just have a bigger change control process to follow, so it takes time. Until then, 'ren *.MINI *.MINISCN' is invaluable. I'll be reporting it as a bug as well.