.SDF File Extension
File Type 1Spatial Data Format File
Geodatabase format used to store infrastructural and geospatial data; supports multiple feature classes, which may each contain multiple geometric properties; optimized for large datasets of spatial information.
The SDF format was developed by Autodesk and is used by several Autodesk programs, including Autodesk MapGuide Enterprise and AutoCAD Map 3D.
File Type 2SQL Server Compact Database File
Compact relational database developed by Microsoft, also known the SQL Server Compact (SQL CE) format; designed for applications that run on mobile devices and desktops; contains the complete database contents and can be up to 4GB in size.
NOTE: Previous versions of SQL Server Compact were distributed as SQL Server for Windows CE and SQL Server Mobile Edition.
File Type 3Standard Data File
Standard database format used for storing data in a structured format; uses fields of fixed lengths to store values; can be imported and exported by various database and data analysis programs; commonly used for transferring data between different programs.
File Type 4Structure Data File
Chemical data file created in the Structure Data File (SDF) format, which was developed by Molecular Design Limited (MDL); saved in plain text and contains chemical structure records; used as a standard exchange format for chemicals information.
Molecular Design Limited was renamed to MDL Information Systems and then later was acquired by Symyx Technologies, the organization that now maintains the SDF format.
File Type 5World in Conflict Game Map
This file is saved in a binary format, which requires a specific program to read its contents.
Map file used by World in Conflict, a real-time tactics war simulation game; stores the terrain, spawn points, item locations, and other map details; used for multiplayer gameplay.
Custom maps can be created using WicEd, the World in Conflict map editor.