Seek 'n' Link is an offline search tool, primarily for HTML files, but which can also be used to search other types of file. The results of the search are put in an HTML file, which is then launched in the browser on your system currently set up to handle these files.
The software is written using the same in-house library as WebChange for RISC OS and, as a result, shares the same wildcard search facilities that are available in that application.