File Type 1 Generic IconStandard Data File
File Format Standard
Usage Open manually
Popularity ★ ★ ★ ★ ★  Popular

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.

Open With


Updated 2007
File Type 2 Spatial Data Format File IconSpatial Data Format File
File Format Standard (developed by Autodesk)
Usage Open manually
Popularity ★ ★ ★ ★ ☆  Common

The Spatial Data Format (SDF) is a geodatabase format developed by Autodesk. It is used to store spatial information in a standard, structured format. SDF files are supported by AutoCAD and other Autodesk programs.

Info About Autodesk AutoCAD

AutoCAD is a professional CAD (computer-aided design) program used for 2D and 3D design and drafting. It can be used for multiple purposes, including 3D model creation, architectural design, and parametric drawing. AutoCAD includes multiple design tools and and be expanded using of third-party add-ons.

Open With

IconAutodesk AutoCAD Map 3D

IconAutodesk AutoCAD Civil 3D

IconSafe Software FME Desktop


IconMapGuide Open Source

Updated November 6, 2009
File Type 3 Generic IconSQL Server Compact Database File
File Format Proprietary (Microsoft)
Usage Open manually
Popularity ★ ★ ★ ☆ ☆  Average

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.

Important: Previous versions of SQL Server Compact were distributed as SQL Server for Windows CE and SQL Server Mobile Edition.

Open With

IconMicrosoft SQL Server

IconMicrosoft Visual Studio


Updated November 4, 2016
Information from the PC File Extensions Reference