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From WiX Wiki at MindCapers

There is enough registry information to warrant a category.

Getting Registry Information from Components

I think you want Mine. Mine allows registration to be extracted from .reg, .dll, and .tlb files and to be output in CMI XML or .inf format. This is especially useful for creating setup manifests. There is also regcap.exe in the Visual Studio\Common7\Tools\Deployment. It produces a .reg file of the entries.

WiX Registry Examples

    <Registry Action='write'
              Id='reg_ff_extension'
              Key='Software\Mozilla\Firefox\Extensions'
              Name='{57E72829-C158-4341-BBED-58F0AD1740FD}'
              Root='HKLM'
              Type='string'
              Value='C:\path\to\ext' />