With Nautilus Scripts you can convert audio files, convert and install packages, automatically convert CDs to .iso files, compile C/C++ programs for Linux/Windows, and much more. The installation is a snap -- just extract the contents of the download to $HOME/.gnome2/nautilus-scripts/ and you'll be all set. Your expanded right-click menu will automatically be created.
Nautilus Scripts is a free download and requires Gnome and Nautilus. In order to use some of the advanced features of Nautilus Scripts you'll also want to install the following packages: mingw32, wine, alien, and build-essential.
Nautilus Scripts [Gnome-Look]
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