Sorry Win 7 SP2
To be honest, i don't what those are either, as far as photoshop is concerned.
Is the course specific to one subject or a general photoshop course?
Here's a list of some of the most common kinds of photoshop files and the relevant extensions
Not known here in the Photoshop forum.
The course material or the instructor should tell you what they are and how to use them.
Its a preset pack for light room called Serge Ramalli Lightroom Presets which also has a folder called PhotoSerge-Movies-PS, which include files such as Blue-Lime.xmp. I'm just assuming they are presets for photoshop, which gives a movie type mood.
No, LightRoom and Photoshop are two different applications.
It seems those are for photoshop Lightroom, which is different program from photoshop cc 2014.
Although there do seem to be some presets included that work in photoshop as well.
See the Read Me First on Presets