File Extensions & Associations

Hi,
One of my self-written Programs stores data in files with a own extension.
I want to make a association, so that I only have to double click on the data file and it is open with my application.
I know how to do this in windows, but i want want my program to check, if theres an association with this file type, and if not, ask, if he should create one (and then do this)

But I don't know
a) how to check an association
b) how to create an association
(with visual baisc)

thx,
Tom

You will find all answers here:
http://www.mvps.org/vbnet/code/syste...executable.htm
http://www.mvps.org/vbnet/code/reg/r...sociations.htm
http://www.mvps.org/vbnet/code/reg/association.htm

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