From develope IT:
File extension database with complete Windows integration for unknown documents. SearchExt is a stand-alone application as well as a fully integrated file context menu extension to search for unknown documents and files with extensions of unknown files on your Windows system. Actually more than 6100 file extensions with its description and assigned applications are in the SearchExt list updated via the Internet. Special feature is the fully-integrated file-extension search engine accessible in the context menu of each file.