In a pinch, if you have work stored in the Gnumeric format, and want to use the contained data, but Gnumeric is not installed on the system you are working on, there is an easy way to extract the data. Gnumeric uses the .gnm extension to store files. Just change the extension to .gzip, which is a common zipping package in Linux. If you are working on a Linux system, you can do this using pre-installed tools. If, however, you are working on a Windows machine, you will need an unpacker that supports the .gzip format (peazip is a popular one). The data is extracted as an .xml file, which is compatible with many programs, and can even be opened in a text editor.