BleepingComputer Review:

Everything Desktop Search provides instant indexing of all files on a Windows-formatted drive and allows users to locate any file by partial name, path, or regular expression and see the results as they type.

Company’s Description:

“Everything” is an administrative tool that locates files and folders by filename instantly for Windows.
Unlike Windows search “Everything” initially displays every file and folder on your computer (hence the name “Everything”).
You type in a search filter to limit what files and folders are displayed.