Typically the horizontal coordinate is on the left and the vertical on the right. So that means you've only got about 1/4 of the coordinates here for what appears to be the upper surface since it peaks at 9'ish percent. The left column only goes to .53282 or 53.282% so that's why I'm sure you're missing 75% of the coordinates. If that's all you've got then this file is corrupt.

As for the extension there were no lack of airfoil plotting software solutions a few years back. But often the files were interchangeable just by changing the file extension to make the next program see it as being compatible. I think it's fair to say that these days, and thanks to Selig and his coworker's efforts, the "standard" is the Eppler format.