TOSVersion gives the wrong result

Question

I have a 64-bit Windows 7 client installed on his computer. Below the same code are different results in a dummy application and in my application. My application is a group project and has 25 packages.

TOSVersion.Name: Windows 7
TOSVersion.ToString: Windows 7 Service Pack 1 (Version 6.1, Build 7601, 64-bit Edition)

TOSVersion.Name: Windows XP
TOSVersion.ToString: Windows XP Service Pack 3 (Version 5.1, Build 2600, 64-bit Edition)

What could be causing the problem?

Auto Generate manifest file options. The .manifest file is missing, but I could find the "supportedOS" entry in the .res file in both projects. Both have the same content, as shown below:

<compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1"> 
    <application> 
        <!--The ID below indicates app support for Windows Vista -->
        <supportedOS Id="{e2011457-1546-43c5-a5fe-008deee3d3f0}"/> 
        <!--The ID below indicates app support for Windows 7 -->
        <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>
        <!--The ID below indicates app support for Windows 8 -->
        <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
        <!--The ID below indicates app support for Windows 8.1 -->
        <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
        <!--The ID below indicates app support for Windows 10 -->
        <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>          
    </application> 
</compatibility>

Answer 1

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Event Log\Application and Services\Microsoft\Windows\Application-Experience\Program-Telemetry