Files:

In the list in this box you select the file you want to load. If you select a folder, all files in that folder will be loaded. If the Include subfolders check box is checked, all subfolders and their content are loaded as well. The folder structure is rebuilt in the ITP/MDK Repository. Empty subfolders or subfolders containing no files that comply with the mask, are not loaded.
If you used the Load from... before the content of the last folder you selected will be listed here filtered by the mask.
Note that if no file or folder is selected in the Files pane all files in the Files pane will be loaded, including all files in subfolders.