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Asked: 2026-05-13T20:21:39+00:00

I have multiple projects in a single Visual Studio (2008) solution. I just discovered

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I have multiple projects in a single Visual Studio (2008) solution.
I just discovered that each of these projects uses a same GUID, so in the solution file it looks like this:

Project("{FAE04EC0-F103-D311-BF4B-00C04FCBFE97}") = "Pro1", "Pro1\Pro1.csproj", "{...}"
Project("{FAE04EC0-F103-D311-BF4B-00C04FCBFE97}") = "Pro2", "Pro2\Pro2.csproj", "{...}"

Do I have to change these GUIDs so they’re unique and what are they used for?

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1 Answer

  1. Editorial Team

    Project persistence block in a solution file has the following format:

    Project("{project type GUID}") = "<Project name>", "<project file location>", 
    "{<Unique project GUID>}"
EndProject

    So it’s expected that first GUID is non-unique, it uniquely identifies Visual Studio package that handles this type of projects.

    The GUID you posted is interesting – it looks like mangled C# project GUID, which is FAE04EC0-301F-11D3-BF4B-00C04F79EFBC. Did you change it yourself or is it a posting issue (e.g. you are using right-to-left locale such as Hebrew or Arabic).

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