creating custom file extension

[EDN Admin]

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Dear Moderators,
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<p align=left>dont get angry if this question doesnt relate to what we can ask in msdn forums but i need help so i had to do this
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<p align=left>My question is : -
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<p align=left>Let us suppose i want to create an application which analyse some special reports related to a particular task done in a week or month. So, i create an application which displays my .curpt (custom report files) nothing else now these files let us say have some text data some graphs etc. then how to make such custom files and how to make them bind with my app so that it can only open .curpt files and if any one tries to open other file he/she gets an error saying unknown format.
<p align=left>just like example ms word (we can only see files whose format is supported by msword)
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<p align=left>so in a nutshell i need to know
<p align=left>1. how to create custom files (with custom extension) ?
<p align=left>2. how to tell my application that it should only open that not any other file ?
<p align=left>3. can i do this in .net without any third party support ?
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<p align=left>any kind of help is appreciated
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