Write data from matrix to '.denso' file

Hello,

I have a matrix of 2 columns x 10 rows with numbers

eg. A = [1 2 3 4 .... 10; 10 11 12 ...... 20]

I want to export this data (create a new file) to a filetype with '.denso' format. How do I do this?

Thanks,

Neeraj