1. A system for generating a mapping binary file, comprising a processor to: map a function call from a legacy binary file to a function call from a virtualized namespace binary file by merging an export table from the legacy binary file and an export table from the virtualized namespace binary file, the virtualized namespace binary file to load the function call based on an application programming interface name; store the mapping of the function call from the legacy binary file to the function call from the virtualized namespace binary file in a mapping binary file; store, in the mapping binary file, an exception detected from the merger of the export tables; store the mapping binary file in a storage location accessible by a loader; and implement a precedential binary file ordering to indicate that a system binary file is to be loaded prior to the mapping binary file in response to detecting the precedential binary file ordering.