How to open .PHP3 file extension?

If you cannot open a new file that has been saved in the .PHP3 format you need to download the appropriate software. The manufacturer of .PHP3 files is N/A; .PHP3 files belong to the Web 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 .PHP3 files. Activities performed in the order described should solve the problems with all the files in the .PHP3 format.