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; and 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, the binary creator to store, in the mapping binary file, an exception detected from the merger of the export tables, the binary creator to store the mapping binary file in a storage location accessible by a loader.