Fragments: stores WiX fragments that are either auto generated by Heat.exe directory harvesting or manually built like inserting some values into the registry. Includes: stores WiX include files that hold pre processor variables. Wxi files must be included at the top of each wxs file you're using variables in. Lang: stores localization stuffClick a text element and then click + Add Variable . Variable name: You can name a variable anything you want, but it should be meaningful to you so you can identify it later. Under Fallback value, write a replacement text that appears in case you're missing that specific piece of data. (For example, if you don't have your user's name, you can add "Customer" or "Buddy", depending on what fits your situation best.) Stryde discount code.