how to associate a user-defined function with a certain file type when clicking on it in matlab

I work with files whose extension is ODF. They are only known to my colleagues and myself. In the "Current Folder" window, I click on such file, and this invokes some user-defined function.

Where and how is this set up??? How can I change it?

I am quoting http://www.mathworks.com/help/techdoc/matlab_env/f8-8880.html

Hence to rephrase my question, how do I associate *MATLAB tool* with a user-defined file type? Obviuosly, someone has configured it in my matlab.

Thanks,

Yuri Geshelin

[Kaustubha Govind]

Are you certain that a user-defined function is being invoked, and not something like the "Import Wizard" tool?