These are templates for the PolyMesh editor. They belong in a folder within your "plugins" folder, called "PolyMeshTemplates" (no spaces). You will need the PolyMesh Plugin to use these; the plugin is available by going to Tools -> Scripts and Plugins Manager and clicking on the "Install" tab.

After you put the templates in the correct folder, you can double-click the PolyMesh Editor icon in the AoI toolbar and choose which one of them to draw when you create an object with the PolyMesh tool.

Uploaders, please upload as a ZIP file to save space. ZIP gives really good compression ratios with these files.