By default, all software supports multiple file extensions. Quartus II design software supports at least 2 different file extensions. The basic files that Quartus II design software supports are .VHDL. However, not all of the extensions listed on the list are always used to save the effects of work in Quartus II design software. Very often, files with such extensions are used as source data files used by Quartus II design software.
Quartus II design software 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 Quartus II design software and try to save it in another file format, also supported by Quartus II design software.