Description of problem:

When submitting virtio-win-prewhql driver for attestation signing on the MS Hardware partners portal, the attestation singing fails during the validation stage with the following error:

"Error 1303 in viorng.inf, line 102 : Found legacy AddReg operation defining co-installers (CoInstallers32).

Failed INF validation. INF did not pass Desktop validation (InfVerif /k).
"

Version-Release number of selected component (if applicable):
The test was done with virtio-win-prewhql-0.1-232, but this is MS portal feature - so it will fail with all our previous versions.

How reproducible:

Steps to Reproduce:
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Actual results:

Expected results:

Additional info:
Currently, our cab file (the archive with driver binaries) has all the drivers together. Therefore, attestation signing for all the drivers will fail, although the problem is only in virtio-rng driver.
The keyword relates to the usage of the co-installer in virio-rng driver used to register cryptographic provided in Windows.