Powergrep Portable Link [upd]

: It handles more than just plain text; it can search through binary files, compressed archives (ZIP, 7-zip, RAR), PDFs, Word documents, and Excel spreadsheets. Core Power Features

Even in its portable form, PowerGREP loses none of its "Swiss Army Knife" utility:

If you are not a Regex wizard, PowerGREP acts as a translator. It allows you to perform complex search and replace operations—such as reformatting dates in 1,000 text files, extracting email addresses from a messy data dump, or converting code snippets from one format to another—without writing a single line of script.