EVERYTHING Search Engine - Voidtools
If you want to search your whole computer very quickly for anything - a lost file you half remember the name of, a download that went missing, all the .ico or .msi files, or whatever - then I thoroughly recommend this tiny search tool. I've used several versions over the years - find the latest version entirely free and with no nasty T&Cs at www.voidtools.com or from most reputable download sites. So much quicker and more effective than the search tool built into MS Windows.