Windows: How to create custom appcompat shims (Application Fixes)?

Question

Windows has the capability to apply shims to mis-behaving applications. Shims are used to intercept API calls and change it. For example, shims can be used to:

Answer 1

I'm not aware of any way of someone other than Microsoft implementing an appcompat shim.

You might want to investigate Detours, it might provide the functionality you want.