Why do MEX-files compiled in MATLAB 7.3 (R2006b) not work in previous versions of MATLAB?

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MathWorks Support Team
I compiled a MEX-file in MATLAB 7.3 (R2006b), but the MEX-file does not run in MATLAB 7.2 (R2006a) or any previous version of MATLAB. When I attempt to execute the function in an earlier version of MATLAB I receive the following error:
??? Invalid MEX-file 'H:\Documents\yprime.mexw32': The specified procedure could not be found.

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MathWorks Support Team
This is expected behavior. MEX-files are generally backward compatible but not forward compatible.
A MEX-file created in a given version of MATLAB generally works in subsequent versions. However, MEX-files created in any version of MATLAB are not expected to run in an older version. In some releases, you may find this will work; however, MEX-files compiled with MATLAB 7.3 (R2006b) do not work in previous versions due to a restructuring of the MEX API.

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