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There are several ways to run FEBio on Windows. The easiest way is by simply selecting the FEBio program from the Programs menu or by double-clicking the FEBio icon in the installation folder. However, this runs FEBio with the installation folder as the working folder, and unless the FEBio input files are in this folder, you will need to know the relative or absolute path to your input files. A more practical approach is to run FEBio from a command prompt. Before you can do this, you need to know two things: how to open a command prompt and how to add the FEBio installation folder to your PATH environment variable so that you can run FEBio from any folder on your system [B]  [B] The current FEBio installers should automatically setup the environment path so that FEBio can be run from anywhere on the file system.. The process is slightly different depending on whether you are using Windows XP or Windows 7, so we'll look at the two Windows versions separately.