| Registry DataBase : HKEY_CLASSES_ROOT
= HKCR |
System : 95,
95+IE4.x, 98, ME, NT, 2K
Alias of HKLM\SOFTWARE\Classes
which contains file extensions associations, CLSIDs
file and object types. This key is dynamically recreated
at each startup. |
| Extensions
- CLSIDs
- Context
menu options - Windows 98/ME
- Standard
CLSIDs |
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Extensions |
File
extensions are the extensions of registered file types,
that's why this series of subkeys starts with a dot
except for the * key. This joker refers
to any file type, registered or not. In fact, it
corresponds to .* and adds an option to
the context menu of any file type. You will see the
following subkeys in HKCR extensions entries
:
| \shellex\ContextMenuHandlers |
|
Context menu options.
For instance, Winzip's options
for creating an archive or for adding the
selected file to an existing archive. These
entries refer to a CLSID key
containing the name of the DLL
which supports this menu extension. |
| \shellex\PropertySheetHandlers |
|
Properties
dialog box tabs. These entries refer to a CLSID
key containing the name of the DLL
which displays the property page corresponding to
each tab. |
| \ShellNew |
|
File and options for
creating a new file of this type from the New
menu on the desktop or in folders. Here is an example. |
|
| Some file types will
also display the entry Content Type
which contains character strings such as application/msaccess,
audio/x-midi, or video/x-mpeg.
These are MIME types used to tell
browsers what to do with the data, start an application,
download a file, display some text or a picture, play
some music or a video. These definitions are stored in
the key HKCR \MIME \Database \Content Type. |
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CLSIDs |
CLSID
means class identifier. Key names are unique identifiers
called GUID for globally unique
identifier, made of 32 hexadecimal digits in the
following format : 8-4-4-4-12. You will
see the following subkeys in HKCR\CLSID
entries :
| \Default |
|
Object name |
| \DefaultIcon |
|
Path for associated
icon |
| \InprocServer |
|
Process manager DLL |
| \InprocServer32 |
|
32 bit process
manager DLL |
| \InprocHandler |
|
Process server DLL |
| \InprocHandler32 |
|
32 bit process
server DLL |
| \LocalServer |
|
OLE
local server |
| \LocalServer32 |
|
32 bit
OLE local server |
| \ProgID |
|
Class definiton |
| \MiscStatus |
|
Server data |
| \shell |
|
Application to execute
and parameters, if any. Here is an example and a complete
description of \shell's
options. |
| \shellex |
|
See the Extensions section |
| \ShellFolder |
|
Contains the entry Attributes |
| \ToolboxBitmap |
|
Toolbar parameters |
| \TypeLib |
|
Type libraries |
| \Version |
|
Application version
number |
| \Implemented
Categories |
|
CLSID
dynamically created at execution |
| \QuickView |
|
Quickview manager (sometimes) |
|
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Context menu options |
Key :
HKCR \CLSID \{CLSID} \ShellFolder
Entry : Attributes
System : 95, 95+IE4.x,
98, ME, NT, 2K
Type : REG_BINARY or REG_DWORD |
For example :
Recycle Bin's Attributes
entry : 40 01 00 20
Recycle Bin's context menu options : Properties
(bit 30), Paste (bit 16), Open,
Explore (bit 5)
Enables adding or removing the objects' context menu
options. To combine 2 options or more below, make the sum
of their values and indicate the total.
| Bit |
|
Hex |
|
Action |
| 30 |
|
40 00 00 00 |
|
Properties |
| 29 |
|
20 00 00 00 |
|
Delete |
| 28 |
|
10 00 00 00 |
|
Rename |
| 25 |
|
02 00 00 00 |
|
Cut |
| 24 |
|
01 00 00 00 |
|
Copy |
| 16 |
|
00 01 00 00 |
|
Paste |
| 5 |
|
00 00 00 20 |
|
Open, Explore (\shell subkey
menus) |
|
Also enables
changing object icons :
| Bit |
|
Hex |
|
Action |
| 12 |
|
00 00 02 00 |
|
Adds a hand to the icon, to indicate
it is shared |
| 13 |
|
00 00 04 00 |
|
Adds a big
shortcut arrow to the icon |
| 14 |
|
00 00 08 00 |
|
Gives the icon a disabled look |
|
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Windows 98/ME |
There are keys
specific to Windows 98/ME in HKCR
:
| \.Desklink |
|
Corresponds to the
command Desktop Shortcut in the Send
To submenu of context menus. |
| \.mydocs |
|
The Properties
option of the My Documents icon
leads to a page called Target
showing that the shorcut refers to the indicated
folder, for example C:\My Documents.
The Delete option is replaced
with Remove from desktop. If you
choose that option, the icon is deleted from the
desktop and a ShellNew key is
added into the .mydocs key,
which displays My Documents Folder
in the New menu. If you create a
new My Documents icon on the
desktop, the ShellNew key will
be removed. |
| AllFileSystemObjects |
|
Special class referring
to any file system object type. By default, this
class adds the Send To menu to
each file or folder's context menu. |
|