What tool can be used to quickly search for files on a local Windows file cleaner?

Question

Document flow

Introductory: there is an office and 2 remote sites, there are a lot of Excel documents that are stored in the file storage in the office. New files are created in the office, which are immediately edited and printed on the sites. It is necessary to give the ability to quickly search for the desired file from the entire heap (8.5k).
The question arose because files get into the Windows index either too late, or periodically do not get at all, or periodically disappear from the index.
In general, please tell me a tool (ideally free) that can at least partially save me from "again, it is not looking for anything."
Thanks in advance.

Answer 1

DocFetcher - Quick document search
docfetcher.sourceforge.net/ru