This folder contains the Adobe Premiere 4.2 SDK example plug-ins.  
You will find the following 4 items:

Projects - This folder contains the source and project files for 6
example plug-ins.  These samples demonstrate video transition, video 
filter, audio filter, data export, EDL export, and device control
plug-ins.

Built Plug-ins - This folder contains built versions of the 6 
samples.  You can execute them by dragging them to the "Plugins" folder 
contained within the "Premiere" application folder.

Headers - This folder contains the Premiere SDK header files.

Lib - This folder contains the Premiere utility library.