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.launch extension actually becoming a plain text file instead of a .launch file...

Hey guys, I am relatively new to ROS, as i am working with it for my research project. I have been learning fairly quickly on how to navigate through Ubuntu and how to use ROS. I have been working with different things including PID, ros_control, etc, and I have been following tutorials; some of them require me to make a .launch file, simply by making a blank file, and naming it with the .launch extension and copying and pasting the code. When doing all of this, the file does not actually become a .launch file for me, it becomes a plain text file... I did the same thing when creating a .xml file, adding that extension and it became a .xml file.

I'm not exactly sure what I am doing wrong. If anyone has a quick solution it would be much appreciated. Thanks!