An inter-language interface is created for an executable file written in a legacy language. The header associated with the legacy file is initially marked up language to generate a first marked header. The legacy file is then wrapped with a first wrapper based at least partially upon the first marked header to create a first wrapped file. Additionally, the first marked header is associated with type maps customized in accordance with the target language in order to generate a second marked header. An executable file may then be generated by wrapping the first wrapped file with a second wrapper so as to be executable in the target language, thereby creating a second wrapped file. Additionally, an interface layer is generated to associate functions in the legacy language with methods in the target language and to define the usage in the target language of the parameters in the legacy language.