The File Extensions Database


.SID File Extension

  • Developer by: Valve
  • Category: Game Files
  • Format: Binary

What is an .SID file?

.SID is Steam Game Data Backup File

Backup file created by Steam, an application used to download and manage Valve video games on desktop computers; contains compressed game data created by the Steam backup feature (steambackup.exe program); used to backup games to DVDs or other external media.

SID files are created with a .SIS file and a .SIM file, which provide metadata necessary to restore backup game data. SID files use the naming convention {game}_disk{X}_{Y}.sid, where "game" is the name of the backup game, "X" is the disk number, and "Y" is the backup file number on the disk.

NOTE: Steam backups do not include saved games, custom multiplayer maps, or configuration files. You must backup and restore those files manually.

Programs that open Steam Game Data Backup File
Windows
Valve Steam
Mac
Valve Steam
File Type 2 MrSID Image
Developer by: Extensis Category: Raster Image Files Format: Binary

Image created using Multi-resolution Seamless Image Database (MrSID) compression, which was developed by Extensis for compressing large images; commonly used to partition and store large Geographic Information Systems (GIS) images.

NOTE: Extensis was formerly known as LizardTech.

Programs that open MrSID Image
Windows
Extensis GeoExpress
Extensis GeoViewer
Extensis Express Server
Extensis SquishPic
ESRI ArcGIS for Desktop
ERDAS IMAGINE
ACD Systems Canvas X 2019
Mac
Extensis SquishPic
Linux
Extensis Express Server
Extensis SquishPic
File Type 3 SID Audio File
Category: Audio Files

Audio file originally used by Commodore computer systems, but now more often used for playing the sounds on Commodore emulators and SID software players; often used for video game background music and can use mono or stereo audio formats; created for the MOS Technology 6502 processor, which can be emulated by newer desktop software to play the audio.

SID files may use the PSID format or the newer RSID (Real SID) format. While the PSID format is more compatible with general Commodore emulation software, the RSID format requires more complete emulation of the C64 hardware.

Programs that open SID Audio File
Windows
ACID 64 Player
quadraSID
Mac
SIDPLAY
quadraSID
Linux
Audacious
SIDPlayer
File Type 4 ScanIt Document
Developer by: AmsterCHEM Category: Raster Image Files Format: XML

Document created and used by ScanIt, an application used to extract data from graphs; contains the graph image and its metadata; includes axes definitions, document windows, and other document specific options.

The SID file allows you to save your progress and continue it at a later time. The file can be saved to a variety of image formats, such as .JPEG, .PNG, .TIF, and .BMP.

Programs that open ScanIt Document
Windows
AmsterCHEM ScanIt

How to solve problems with SID files

  • Associate the SID file extension with the correct application. On :
    Windows: Right click on any SID file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.SID files". Mac: Right click (or Ctrl-click) the SID file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .SID is Steam Game Data Backup File. Because only the current version supports the latest SID file format. Search, therefore, e.g. on the Valve manufacturer website after an available .SID is Steam Game Data Backup File update.
  • To make sure that your SID file is not corrupted or virus-infected, get the file again and scan it with antivirus software.