How to open .APP file extension?

If you cannot open a new file that has been saved in the .APP format you need to download the appropriate software. The manufacturer of .APP files is Apple; .APP files belong to the Executable 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 .APP files. Activities performed in the order described should solve the problems with all the files in the .APP format.