Steps to reproduce

Get VS 2017 RTW.
Install an “experimental” VSIX of NuGet like the one here by double clicking on it:
\nuget\nuget\Share\Drops\CI\NuGet.Client\dev\2381\artifacts\VS15\NuGet.Tools.vsix
Open PackageManagerConsole…

Expected behavior

correct version of 'NuGet.PackageManagement.PowerShellCmdlets.dll' is loaded

Actual behavior

the wrong NuGet.PackageManagement.PowershellCmdlets.dll is pulled in

Environment data

PSVersion 5.1.14393.693
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.14393.693
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1