.EDMX File Extension
File TypeADO.NET Entity Data Model Designer File
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
What is an EDMX file?
Data model file created by the Entity Data Model Designer component of Microsoft Visual Studio; stores the schema for a database, including entities (e.g., database tables), their fields, and their relationships (e.g., one-to-one and one-to-many).
EDMX files are used for generating SQL Server database schemas. They contain three metadata files: 1) the conceptual schema definition language (CSDL) file, 2) the store schema definition language (SSDL) file, and 3) the mapping specification language (MSL) file.
NOTE: To create EDMX files, you need a version of Visual Studio that includes the ADO.NET Entity Data Model Designer.