How to open .X3F file extension?

If you cannot open a new file that has been saved in the .X3F format you need to download the appropriate software. The manufacturer of .X3F files is SIGMA; .X3F files belong to the Camera Raw Files category. After downloading the application from the list available on our website just run an unknown file, and as the default set the newly installed application supporting the .X3F files. Activities performed in the order described should solve the problems with all the files in the .X3F format.