Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The FOLDER file type is primarily associated with 'Explorer' by Microsoft Corporation. The .FOLDER extension is an entry in the registry that allows Explorer to create a new folder with the characteristics defined by entries in the registry key HKEY_CLASSES_ROOT\.Folder and all related keys. Note: You cannot change a file into a folder by just adding a .FOLDER extension to the name. Windows doesn't work that way.
Important: Invalid file associations could be the result of underlying issues within your Windows PC. It is highly recommended that you scan your PC for invalid registry entries, unused processes and other slowdown issues.
To view technical data on file-extension FOLDER click this link to expand/hide the additional area.
System Info for File Extension .FOLDER
The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and information FILExt collected directly from user systems.
ProgramID: Folder, FileType: Folder, AppName: Windows Explorer EXEFile: explorer.exe