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.suo file in Visual Studio solution projects

Visual Studio uses two type of file

  • .sln
  • .suo

These files help to store solution specific settings of visual studio .

The .suo file is a Visual Studio user settings file that stores data in a structured binary format and is used by VSPackage or solutions created using Visual Studio .

The .suo file contains the user preference configurations or per user settings.

MSDN description can be found in File Types and File Extensions in Visual Studio

Senthil Kumar B
Senthil Kumar is a former Microsoft MVP (Most Valuable Professional). He is a Co-Author of the book "Windows 10 Development Recipes using JavaScript and CSS" for Apress Publication. He is a technical presenter, blogger, mentor and a Geek.  Senthil is a regular speaker is various local user groups. He has presented at conferences like Great Indian Developer Summit (GIDS) & Microsoft DevCamps. You can reach out to him via his Twitter handle @isenthil.