Files tab
Displays the files associated with the project. Drag and drop files in the Files tab to change the order in which the Quartus® Prime software processes them during compilation.
The file type appear on the icon next to each file name listed in the Device Design Files and Software Files folders. The Quartus® Prime software automatically sorts all files into the Device Design Files, Software Files, and Other Files folders, according to file extensions. The Quartus® Prime software sorts design files for Intel FPGA IP cores according to the Quartus Prime IP File (.qip) Definition they are associated with.