Multiple Search and Replace software (version 5.6) is a powerful tool that allows users to search and replace multiple strings of text in multiple files and directories simultaneously. The software supports various file formats, including TXT, RTF, DOC, DOCX, and PDF, and allows users to use regular expressions and wildcards for advanced searches. The software also offers a preview feature that allows users to see the changes before applying them and a log feature that keeps track of all the changes made.