FileLocator is not available for Mac but there are some alternatives that runs on macOS with similar functionality. The best Mac alternative is DocFetcher, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to FileLocator and six of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to FileLocator are Find Any File (Paid), iFileX (Free), SCAN (Smart Content Aggregation and Navigation) (Free) and PST Bridge (Paid).
DocFetcher is a portable German/English open source desktop search application. It allows you search the contents of documents on your computer. - You can think of it as Google for your local document repository.
SCAN (Smart Content Aggregation and Navigation) is a personal semantic content manager for desktop users. It combines search, text analysis, tagging and metadata functions to provide new user experience of desktop navigation and personal document management.
PST Bridge is two applications in one. Not only you may use it to convert your existing Outlook PST files from a Windows PC to your Mac. You may also use PST Bridge to display your PST file contents without the need of conversion.
TextSeek helps you search document contents for Windows and MacOS within seconds, inlcuding PDF, Word, Excel, Powerpoint and other formats. The core feature is that TextSeek can perform search character-by-character with no omission.