Universal Extractor is an archive extractor. It is not a general-purpose app like WinRAR because it cannot create archives, it only extracts them. However, it can extract nearly every archive format out there, including many installers, like INNO, InstallShield, and Windows Installer packages. I use it primarily for extracting installers, it lets me easily test programs inside Sandboxie without having to install them.
Download Universal Extractor from here:
http://legroom.net/software/uniextract
The button extracts the selected archive into a folder with the same name as the selected archive.
<?xml version="1.0"?>
<button backcol="none" display="icon" textcol="none">
<label>Extract</label>
<tip>Exctract with Universal Extractor</tip>
<icon1>C:\Program Files\Universal Extractor\UniExtract.exe,0</icon1>
<function type="normal">
<instruction>"c:/program files/universal extractor/uniextract.exe" {filepath} {file|noext}</instruction>
</function>
</button>