| File Extension: | SI3 |
| File Type Description: | ChessDB Index File |
| File Type Developer: | Interscape |
| Primary Associated Software: | ChessDB |
| Primary Software Developer: | Interscape |
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Interscape developed the ChessDB Index File file type when the ChessDB was initially released. Our data shows that SI3 files are frequently utilized by PC users in Japan and popular on the Windows 10 platform. Most of these users are running the Google Chrome web browser.
 | ChessDB by Interscape |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | Linux |
 | FreeBSD |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .CLASS | Oracle Corporation | Developer Files | Java Class File |
| .Z1 | Check Point Software Technologies Ltd. | Data Files | ZoneAlarm Mailsafe Renamed Data |
| .L2R | NCSoft | Game Files | Lineage II Replay File |
| .LFL | LucasArts Entertainment Company, LLC | Game Files | LucasArts Games Resource File |
| .CBZ | Open Source | 3D Image Files | Comic Book Zip Archive File |
| .EPD | Interscape | Database Files | ChessDB Extended Position Description |
| .GBF | Yuku | Text Files | General Bible Format |
| .LTX | GSC Game World | Game Files | S.T.A.L.K.E.R. Properties File |
| .RIS | Research Systems, Inc | Text Files | Research Information Systems Citation File |
| .AKS | Srinivas Annam | Text Files | Aksharamala Keymap Source |
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