File Extension SI3

.SI3 File

File extension: SI3
File type: Index File
Do you have SI3 - related issues?
First check your registry for hidden errors.


Notes about the SI3 file extension:



Errors in your registry are one of the common causes for incorrect file associations on your windows system. It is highly recommended that you check your registry for file association errors (will also check for any other registry errors).

The SI3 file type is primarily associated with 'ChessDB' by Dr. David Kirkby. ChessDB is a database program used for storing chess games. A ChessDB format database consists of three files: .SI3 (index file); .SN3 (name file); .SG3 (game file) (those 3 are needed to make one database). These are all binary files. Some complete databases are held on the ChessDB web site. At the time of writing, one database (called 'huge') has over 3.5 million games. Other files used in ChessDB are: .PGN (Portable game notation, which is used in lots of chess programs, so is not unique to ChessDB); .EPD (Extended Position Description); .SSO (Search options file); .SOR (Repertoire file); .DAT (used on four files - engines.dat history.dat options.dat and recent.dat) to hold configuration information. All are text files.

Detailed information for file extension SI3:


Primary association: ChessDB
Company: Dr. David Kirkby
File classification: Database
Related links: ChessDB Programmers Reference

Other applications associated with file type SI3:

  • Siemens Mobile Phone (Sound File) by SiemensA specialized General MIDI file in a special Siemens format for mobile phones with 16-tone polyphonic and mono sound. This association is classified as Audio.



Important: When encountering any file extension issues it is always recommended that you run a free scan for Windows registry errors.
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Everytime you install & uninstall software and modify system components your Windows registry is left fragmented with obsolete, corrupted and harmful files.

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