The Weaving Information File standard was established in 1996 as a way to store the instructions to create a weaving draft in a text format. Tempoweave, as do many other weaving design programs, also use a proprietary extension so that more information can be stored about the weaving design. Most all weaving design software programs, including TempoWeave, are also capable of production designs with the "wif" extension so that they can be opened with any weaving design software. The only difference in TempoWeave is that we always save the WIF as well as the TWA file.