Build error on Linux with .NET Core SDK 3

[mfkl]

Hi,

Minimal repro here: https://github.com/mfkl/linux-sdk-extras-netcore3

Microsoft (R) Build Engine version 16.4.0+e901037fe for .NET Core
/usr/share/dotnet/sdk/3.1.102/Sdks/Microsoft.NET.Sdk.WindowsDesktop/targets/Microsoft.NET.Sdk.WindowsDesktop.props(208,3): error MSB4019: The imported project "/usr/share/dotnet/sdk/3.1.102/Sdks/Microsoft.NET.Sdk.WindowsDesktop/targets/Microsoft.WinFX.props" was not found. Confirm that the expression in the Import declaration "Microsoft.WinFX.props" is correct, and that the file exists on disk. 
    0 Warning(s)
    1 Error(s)

dotnet version: 3.1.102
ubuntu version: 18.04.2 LTS

Works fine with <Project Sdk="Microsoft.NET.Sdk"> but I need to use MSBuildSdkExtras for multi targeting.
Works fine with dotnet 2.1.700.

Probably related #133

[mfkl]

dup dotnet/sdk#11108

[Nirmal4G]

The Fix is here: dotnet/wpf#2975