How to set file extension?

Hello there,
I have added the ablility of saving the data in my program. I was wondering how do I restrict the file extension when the user wants to save the file?
What I mean is right now, when a user saves the data to file, they can choose the file name and the file extension. I do not want to allow them to choose file extension. I want to have a predefined extension, for example .usr or .dat.
I have seen this in many applications but I do not know how to implement this. I would appreciate it if someone could help me.
Thanks for your help!

How you are getting the fname from the user has an impact on how you do this, but not what needs to be done. What is required to have something that takes the fname from the user and parses it, extracting a fname. Once you have that, just append the extension that you want and save the file.

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n
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How to set file extension?

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