The information stored here is used to open the correct application when a file is opened by using Explorer and for Object Linking and Embedding. It is a root key that merges HKLM\SOFTWARE\Classes, and HKCU\Software\Classes.
HKCR contains two types of settings. The first type is file associations that associate different file types with the programs that can open, print, and edit them. The second type is class registrations for Component Object Model (COM) objects.
This root key is one of the most interesting in the registry to customize, because it enables you to change a lot of the operating system's behavior. This root key is also the largest in the registry, accounting for the vast majority of the space that the registry consumes.
COM CLASS KEYS
The key HKCR\CLSID contains COM class registrations. HKCR\CLSID\ clsid is an individual class registration, where clsid is the class's class ID, which is a GUID.
| Object | Class identifier |
| Shell folders | |
| ActiveX Cache | {88C6C381-2E85-11D0-94DE-444553540000} |
| Computer Search Results | {1F4DE370-D627-11D1-BA4F-00A0C91EEDBA} |
| History | {FF393560-C2A7-11CF-BFF4-444553540000} |
| Internet Explorer | {871C5380-42A0-1069-A2EA-08002B30309D} |
| My Computer | {20D04FE0-3AEA-1069-A2D8-08002B30309D} |
| My Documents | {450D8FBA-AD25-11D0-98A8-0800361B1103} |
| My Network Places | {208D2C60-3AEA-1069-A2D7-08002B30309D} |
| Offline Files | {AFDB1F70-2A4C-11D2-9039-00C04F8EEB3E} |
| Programs | {7BE9D83C-A729-4D97-B5A7-1B7313C39E0A} |
| Recycle Bin | {645FF040-5081-101B-9F08-00AA002F954E} |
| Search Results | {E17D4FC0-5564-11D1-83F2-00A0C90DC849} |
| Shared Documents | {59031A47-3F72-44A7-89C5-5595FE6B30EE} |
| Start Menu | {48E7CAAB-B918-4E58-A94D-505519C795DC} |
| Temporary Internet Files | {7BD29E00-76C1-11CF-9DD0-00A0C9034933} |
| Web | {BDEADF00-C265-11D0-BCED-00A0C90AB50F} |
| Control Panel folders | |
| Administrative Tools | {D20EA4E1-3957-11D2-A40B-0C5020524153} |
| Fonts | {D20EA4E1-3957-11D2-A40B-0C5020524152} |
| Network Connections | {7007ACC7-3202-11D1-AAD2-00805FC1270E} |
| Printers And Faxes | {2227A280-3AEA-1069-A2DE-08002B30309D} |
| Scanners And Cameras | {E211B736-43FD-11D1-9EFB-0000F8757FCD} |
| Scheduled Tasks | {D6277990-4C6A-11CF-8D87-00AA0060F5BF} |
| Control Panel icons | |
| Folder Options | {6DFD7C5C-2451-11D3-A299-00C04F8EF6AF} |
| Taskbar And Start Menu | {0DF44EAA-FF21-4412-828E-260A8728E7F1} |
| User Accounts | {7A9D77BD-5403-11D2-8785-2E0420524153} |
| Other | |
| Add Network Places | {D4480A50-BA28-11D1-8E75-00C04FA31A86} |
| Briefcase | {85BBD920-42A0-1069-A2E4-08002B30309D} |
| | {2559A1F5-21D7-11D4-BDAF-00C04F60B9F0} |
| Help And Support | {2559A1F1-21D7-11D4-BDAF-00C04F60B9F0} |
| Internet | {2559A1F4-21D7-11D4-BDAF-00C04F60B9F0} |
| Network Setup Wizard | {2728520D-1EC8-4C68-A551-316B684C4EA7} |
| Run | {2559A1F3-21D7-11D4-BDAF-00C04F60B9F0} |
| Search | {2559A1F0-21D7-11D4-BDAF-00C04F60B9F0} |
| Windows Security | {2559A1F2-21D7-11D4-BDAF-00C04F60B9F0} |
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