Opening a SI3 File

The SI3 file type is primarily associated with ChessDB.

SI3	File extension: SI3
	File type:	Index File

What is a SI3 file?

SI3 files mostly belong to 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.

How to open a SI3 file

You need a suitable software like ChessDB to open a SI3 file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your SI3 file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a SI3 file directly in the browser:. Just drag the file onto this browser window and drop it.

Online SI3 Text Viewer

Choose your .si3 file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert SI3 files:

ChessDB by Dr. David Kirkby
See the previous paragraphs to learn more about the main application. SI3 files are often referred to as ChessDB databases because this type of file is primarily created or used by this software.
Siemens Mobile Phone (Sound File) by Siemens
A specialized General MIDI file in a special Siemens format for mobile phones with 16-tone polyphonic and mono sound. This file format is classified as Audio.

Technical Data for SI3 File Extension

File classification:

Database

Related files:

epd, sso, sg3

Related links:

ChessDB Programmers Reference

Mime type:

application/octet-stream

a si3 Index File is a special file format by Dr. David Kirkby and should only be edited and saved with the appropriate software.

How to solve problems with SI3 files

Associate the SI3 file extension with the correct application.
Update your software that should actually open index files. Because only the current version supports the latest SI3 file format. Search, therefore, e.g. on the Dr. David Kirkby manufacturer website after an available ChessDB update.
To make sure that your SI3 file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .SI3 file online - secure, fast, and no downloads needed.