Windows Explorer folder file
FOLDER is a file extension used to define a Windows Explorer folder. FOLDER extensions are used in the Windows Registry to define a folder and contains the folder characteristics. The contents of the FOLDER file are used as a template when creating new folders from within Windows Explorer.
The FOLDER file extension is also used for Macintosh folder extension files.
Learn more about .FOLDER files:
See questions and answers about working in Windows Explorer.
Visit the Microsoft web page.
How to read Registry Values at ITKnowledgeExchange.com.
See tutorials on working with folders in Windows Explorer.