[ubuntu-us-mi] Humble Indie Bundle question

[Matt Arnold]

I bought the Humble Indie Bundle at www.humblebundle.com and started
downloading the Linux versions of the games. The download for Braid is
braid-linux-build2.run.bin. When I double-click it, I get this
message:

Could not display "/home/matt/Downloads/braid-linux-build2.run.bin".

What is a .run.bin file type? What do I do to install it?

-Matt