How to link to programs

["Brijesh Lal" <brijeshlal@wipro.co.in>]

Sir,
    I made a button in QT. I want to open a midi file on clicking the button.
How can link the event to the file which I want to open.

Regards,
Brijesh Lal. B,
Wipro Limited,
Pondicherry.
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