Notes about the PIFAST file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The PIFAST file type is primarily associated with 'PiFast' by Xavier Gourdon and PAscal Sebah. The .pifast file contains data which permits to compute constants. PiFast is a simple software package written by Xavier Gourdon to compute p with a very large number of digits. PiFast is avalaible on several platforms. It can also compute E and a large family of user defined constants.
Detailed information for file extension PIFAST:
File classification: Database
To change file associations press Windows Key
and then Apps and Features
> Default apps
> Choose default apps by file type
Invalid file associations could be the result of underlying issues within your Windows PC.