If I take Unity 2018.4.3f1 and do the following; New 3D Project Change the Build Settings to specify Device of HoloLens, x86, D3D build, Target SDK 18362, Min SDK 10240, Build Configuration: Release Switch platform to UWP Change the XR Settings to "Virtual Reality Supported" which (on my system) brings in the "Windows Mixed Reality SDK" from package "Windows Mixed Reality 1.0.12" Build the UWP project Make an APPX for Store Submission from the generated C++ Project, requesting to include the pieces for the Master configuration for x86 only. And then I find that if I run the "Windows Application Certification Kit" (WACK) or submit the .APPX to the Windows Store then I seem to get a report which fails the .APPX in both the; "Supported API Test" "Package Sanity Test" sections and this looks to be because of the presence of 3 64-bit DLLs; HolographicAppRemoting.dll PerceptionDevice.dll UnityRemotingWMR.dll I can see these 3 DLLs in my UWP folder and they all appear to be 64-bit DLLs (from dumpbin) but I'm not sure why they are there as I do not have holographic remoting switched on (as far as I know!). I also see these 3 DLLs listed in the file Unity Data.vcxitems with each one set to have a DeploymentContent value of true. I find that if I toggle that value to false for each of the 3 DLLs and then remake my APPX then it passes the WACK test. Is this a bug in 2018.4.3f1 or the WMR package 1.0.12 or am I just not setting a switch somewhere?