SDF file extension

 Microsoft compact relational database format that is also called the SQL Server Compat (SQL CE) format. This format was created for programs that are executed on mobile devices and desktops. Includes the complete database contents and may be up to 4GB in size.

This is a default database format that is used to save information using a structured format. These files use fields of fixed lengths for saving values and may be imported or exported by several database and data analysis applications. The files are usually used to transfer information between various applications.

Produced using the Structure Data File (SDF) format (created by Molecular Design Limited - MDL) chemical data file that uses a plain text formatting and stores chemical structure records. This file serves as a default exchange format for chemicals data. SDF format is now maintained by Symyx Technologies, who aquired MDL Information Systems (previously called Molecular Design Limited).

World in Conflict (real-time tactics was simulation video game) map file with the terrain, spawn locations, item locations and other map elements. This map is used in multiplayer gameplay. WicEd (World in Conflict map editor) can be used to generate custom maps.

This is a geodatabase format that is used for saving infrastructural and geospatial information and is compatible with several feature classes that can include many geometric settings. The format is optimized for large datasets of spatial data. SDF format was created by Autodesk and is used by such Autodesk applications as Autodesk MapGuide Enterprise and AutoCAD Map 3D.