How do I filter files in an OpenFileDialog based on the contents of the file ?

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C#

Hi, I am quite new to C# and the .Net framework and was wondering if I can get some advise on this particular topic,

My requirement is that, I need to have an OpenFileDialog for my application, but with a slight difference in its behavior. I have files with a custom extension as *.sda, also these sda files have versions associated with them. The versions are the first 4 bytes of the files. However, without regard to the version number they all have the same extension sda.

If I filter the files with sda extension, OpenFileDialog shows all SDA files. I would like to alter its behavior where it reads the version number of the SDA files and displays only a particular versioned SDA files. Thus, it is a question of filtering files based on their content and not on their extension.

How about achieving this ? Any ideas are appreciated.
Pardon my poor English....