This text is missing some spaces, please add them: Youcanevenselectallfilesbyjustclickingon"Markall"optionwhichyoucanseeonlefthandsideofwindow
You can even select all files by just clicking on "Mark all" option which you can see on left hand side of window

This text is missing some spaces, please add them: c)ispartofalargerenvironment(anothersystem);
c) is part of a larger environment (another system);

This text is missing some spaces, please add them: ThisallowstheintelligenceofWindowstodecidethecorrectsoftwareapplicationtoopenyourXGLfile.
This allows the intelligence of Windows to decide the correct software application to open your XGL file.