Cannot unzip sprc941a.gz

Hi,

I want to use PRU with L138LCDK. After I download sprc941a.gz from http://www.ti.com/tool/sprc940 on Ubuntu 12.04 LTS, I run gunzip sprc941a.gz. I find that it renames sprc941a.gz to sprc941a.

Although the following link said that he can unzip:

http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/p/51992/185080.aspx

It seems that my computer behaves different with theirs. What is wrong?

Thanks,