This folder contains all files required to open the project in the EAGLE PCB software (download here) :
- .epf : the project file as main entry point (is connected with the description file)
- .sch : schematic file
- .brd : pcb layout file
These files should (grouped in a folder) either be copied in Eagle's project directory (see below image of the settings window). The Eagle directory settings also accept multiple paths. The Eagle syntax requires columns as path separators.