> just generate, in a loop, a series of assemblies that each purport compatibility with Windows ABI vX.Y.Z
The Microsoft developers already thought of that trick. What you declare is not compatibility with "Windows ABI vX.Y.Z"; you declare compatibility with an UUID which represents that Windows version. That is, if you're compatible with Windows 8 you say "I'm compatible with 4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38", if you're compatible with Windows 8.1 you say "I'm compatible with 1f676c76-80e1-4239-95bb-83d0f6d0da78", and so on. Since you cannot predict the UUID for future Windows versions, you cannot pretend to be compatible with them.
Is there any API you can go through to get the UUID of the current ABI, all the ones seen by the system, or all of the ones for each windows ABI without network access?
Trivially, you grab the UUIDs from a server somewhere. A smarter trick is to get these UUIDs from the system you're running on.
The Microsoft developers already thought of that trick. What you declare is not compatibility with "Windows ABI vX.Y.Z"; you declare compatibility with an UUID which represents that Windows version. That is, if you're compatible with Windows 8 you say "I'm compatible with 4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38", if you're compatible with Windows 8.1 you say "I'm compatible with 1f676c76-80e1-4239-95bb-83d0f6d0da78", and so on. Since you cannot predict the UUID for future Windows versions, you cannot pretend to be compatible with them.