I must be an idiot, but for the life of me I can't figure out how to create/save a project folder. I'm trying to do something similar to TextMate, where a parent folder is saved as a project I can then open to edit all files inside. In Sublime I open a folder, save a .sublime-project file, then double-click on the saved file. All I get is the markup of the .sublime-project file itself (not exactly helpful).
So then I tried the "Add Folder to Project" action. Did that, saved, double-clicked, blasted .sublime-project file view again with no folder linked.
What am I doing wrong? Can't find anything in the documentation that explains how this is accomplished.