Why are P-files creating problems with different MATLAB releases?

use case 1:

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I generate a P-file from a MATLAB function in MATLAB 7.8 (R2009a). When I try to run this P-file in MATLAB 7.6 (R2008a), I receive the following error message:

% error ... unrecognized file<here

Use case 2:

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I generate a P-file from a MATLAB function in MATLAB 7.11 (R2010b). When I try to run this P-file in MATLAB 7.2 (R2006a), I receive the following error message:

 error... Corrupt P-file ...

Answer 1

[MathWorks Support Team]

This change has been incorporated into the documentation in Release 2010b (R2010b). For previous releases, read below for any additional information:

The process of the decrypted intermediate MATLAB code format has changed in MATLAB 7.6 (R2008a). Therefore, a P-file generated in MATLAB 7.6 (R2008a) or later will not run in older releases.

To avoid this issue, use the same version of MATLAB for generation and execution of a p-code file.