I tested it on Word docx and doc and other files for content and it works brilliantly. You can configure it to just monitor particular folders if you wish, run as a service, etc. etc. Command line supported as well. I've used this in environments with massive (20 million)+ files and had great success too.
I have been using it for years to find updates to (most) of my apps. I've seen version 2.55 in there for a while reported by a user, so just wondering.
After futzing about and trying different ones, I wanted something a bit smaller for my hands, and that didn't have too many buttons, which could function as a daily work mouse and as a gaming mouse.
I tried the G9* and G7* series from Logitech, and a few others, before finally realizing I didn't need to spend a lot. I got the G203 and it's been very solid... enough buttons to do what I need in an office, enough buttons to do what I want for gaming, and solid performance. Plus it's wired, which (oddly) was a requirement for me - I've never been a fan of the wireless mice.
My backup mouse which I had for years and still works brilliantly is an older M510 series. I don't think you can go wrong with those.