System.Management 9.0.0 throws an exception

[GitUser200607]

            var query = new WqlEventQuery(string.Format(
            "SELECT * FROM RegistryValueChangeEvent WHERE Hive = 'HKEY_LOCAL_MACHINE' AND KeyPath = '{0}' AND (ValueName = '{1}' OR ValueName = '{2}')",
            keyPath.Replace("\\", "\\\\"), valueName1, valueName2));

The exception is:

System.PlatformNotSupportedException: 'System.Management currently is only supported for Windows desktop applications.'

But version 8.0.0 does not throw the exception.

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[ViktorHofer]

What's the OS that you are running on? Please share a small repro so that we can diagnose this further.

[GitUser200607]

SystemManagementErrorExample.zip

The problem with <TargetFramework>net6.0-windows10.0.19041.0</TargetFramework> in file SystemManagementErrorExample.csproj if I set <TargetFramework>net8.0-windows8.0</TargetFramework> it runs fine, but for MY project I need windows10.0.19041.

OS: Windows 10 Pro Version 22H2 OS build 19045.5131

[ViktorHofer]

Using the 9.0.0 packages with a net6.0 TFM isn't a supported scenario. See the errors below that I get when I build:

PS C:\Users\vihofer\Downloads\SystemManagementErrorExample\SystemManagementErrorExample> dotnet run
C:\Users\vihofer\.nuget\packages\system.codedom\9.0.0\buildTransitive\netcoreapp2.0\System.CodeDom.targets(4,5): warning : System.CodeDom 9.0.0 doesn't support net6.0-windows10.0.19041.0 and has not been tested with it. Consider upgrading your TargetFramework to net8.0 or later. You may also set <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings> in the project file to ignore this warning and attempt to run in this unsupported configuration at your own risk.
C:\Users\vihofer\.nuget\packages\system.management\9.0.0\buildTransitive\netcoreapp2.0\System.Management.targets(4,5): warning : System.Management 9.0.0 doesn't support net6.0-windows10.0.19041.0 and has not been tested with it. Consider upgrading your TargetFramework to net8.0 or later. You may also set <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings> in the project file to ignore this warning and attempt to run in this unsupported configuration at your own risk.
C:\Users\vihofer\.nuget\packages\system.codedom\9.0.0\buildTransitive\netcoreapp2.0\System.CodeDom.targets(4,5): warning : System.CodeDom 9.0.0 doesn't support net6.0-windows10.0.19041.0 and has not been tested with it. Consider upgrading your TargetFramework to net8.0 or later. You may also set <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings> in the project file to ignore this warning and attempt to run in this unsupported configuration at your own risk.
C:\Users\vihofer\.nuget\packages\system.management\9.0.0\buildTransitive\netcoreapp2.0\System.Management.targets(4,5): warning : System.Management 9.0.0 doesn't support net6.0-windows10.0.19041.0 and has not been tested with it. Consider upgrading your TargetFramework to net8.0 or later. You may also set <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings> in the project file to ignore this warning and attempt to run in this unsupported configuration at your own risk.
C:\Users\vihofer\.nuget\packages\system.codedom\9.0.0\buildTransitive\netcoreapp2.0\System.CodeDom.targets(4,5): warning : System.CodeDom 9.0.0 doesn't support net6.0-windows10.0.19041.0 and has not been tested with it. Consider upgrading your TargetFramework to net8.0 or later. You may also set <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings> in the project file to ignore this warning and attempt to run in this unsupported configuration at your own risk.
C:\Users\vihofer\.nuget\packages\system.management\9.0.0\buildTransitive\netcoreapp2.0\System.Management.targets(4,5): warning : System.Management 9.0.0 doesn't support net6.0-windows10.0.19041.0 and has not been tested with it. Consider upgrading your TargetFramework to net8.0 or later. You may also set <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings> in the project file to ignore this warning and attempt to run in this unsupported configuration at your own risk.

When I downgrade the package version to 8.0.0 (which supports net6.0), the warnings go away and the app runs successfully. The technical explanation is that when targeting net6.0, the netstandard2.0 System.Management assembly is used instead which doesn't work with net6.0.

[GitUser200607]

So what should I do to evade this error? Downgrade the package?

[vcsjones]

So what should I do to evade this error?

Ideally you would move to a supported version of .NET, since .NET 6 recently went out of support, either .NET 9 or .NET 8.