How to Open a RAR File Without WinRAR. Since many email providers impose a file size limit on email attachments, the RAR format is ideal if you want to compress and send multiple large files ...

The RAR file format is also sometimes used for sensitive files, since it can be password protected.

RAR files are a counterpart to ZIP files, and can be quite nifty to work with. We explain what a RAR file is, and how to open RAR files.

How to Open a TrueCrypt File. The free, open-source TrueCrypt file encryption program allows you to create encrypted container files for protecting sensitive data.

With the file open in Pages, Numbers, or Keynote, select File and then Set Password to choose and apply your password.