By default, all software supports multiple file extensions. GPX Viewer supports at least 1 different file extensions. The basic files that GPX Viewer supports are .OSM. However, not all of the extensions listed on the list are always used to save the effects of work in GPX Viewer. Very often, files with such extensions are used as source data files used by GPX Viewer.
GPX Viewer 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 GPX Viewer and try to save it in another file format, also supported by GPX Viewer.