How to merge a merge module of x64 to a msi module of ARM64.

[taka-ka]

I would like to a merge a merge module of x64 to a msi module of ARM64.
But a error occures with the following message.

xxx.msm' is a 64-bit merge module but the product consuming it is 32-bit. 32-bit products can consume only 32-bit merge modules.

It seems that when the MergeEx function called, the error type of msmErrorPlatformMismatch was returned.
I was trying to register the latest mergemod.dll (5.0.22000.194) , but the result was same.

[robmen]

The exact error message is probably a little dated but I think it's pointing in the right direction. When a Merge Module declares its supported platform, the merge tooling will not merge it into a mismatched platform. In this case, the error message should probably say The MSM is x64 but the product is ARM64. x64 merge modules can only be merged into x64 products. It's possible that Microsoft needs to update the Merge API to add ARM64 into its support matrix.