How to open and read an unknown extension file

[varnikat t]

I am trying to do this
if os.path.exists("*.*.txt"):
            file=open("*.*.txt")
            self.text_view.get_buffer().set_text(file.read())
else:
            file=open("*.*.html")
            self.text_view.get_buffer().set_text(file.read())

It gives error *.*.txt not existing....There are two files in the folder
testing.pnm.txt
and testing.pnm.html
How to make it open any name and extension file and read it?

Regards
Varnika Tewari
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