By default, all software supports multiple file extensions. 3rd PlanIt supports at least 1 different file extensions. The basic files that 3rd PlanIt supports are .3PI. However, not all of the extensions listed on the list are always used to save the effects of work in 3rd PlanIt. Very often, files with such extensions are used as source data files used by 3rd PlanIt.
3rd PlanIt can be used to convert file formats between the file extensions listed below. You can open a file with one of the file extensions below via 3rd PlanIt and try to save it in another file format, also supported by 3rd PlanIt.