Editing Fat binary (section)

===Combined binaries for CP/M-86 and DOS===
[[CP/M-86]] and DOS do not share a common file extension for executables.<ref group="nb" name="NB_CP/M-86"/> Thus, it is not normally possible to confuse executables. However, early versions of DOS had so much in common with CP/M in terms of its architecture that some early DOS programs were developed to share binaries containing executable code. One program known to do this was [[WordStar 3.20|WordStar&nbsp;3.2x]]<!-- at least 3.20, 3.21 and 3.24 (February 1983) -->, which used identical [[overlay file]]s in their [[software port|port]]s for CP/M-86 and [[MS-DOS]],<ref name="Necasek_2018_WordStar"/> and used dynamically fixed-up code to adapt to the differing calling conventions of these operating systems at [[runtime (program lifecycle phase)|runtime]].<ref name="Necasek_2018_WordStar"/>

[[Digital Research]]'s [[Graphics System Extension|GSX]] for CP/M-86 and DOS also shares binary identical 16-bit drivers.<ref name="Lineback_GSX"/>