Talk:Windows Shell Extension: Difference between revisions
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Paradox-01 (talk | contribs) (in theory: if UserChoice is used, you have to edit its linked key (../shell) (better do backup and restore it when your own changes get uninstalled)) |
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====System overrides (backups ? | ====System overrides (backups) ?==== | ||
Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ApplicationAssociationToasts | Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ApplicationAssociationToasts | ||
Applications\NOTEPAD.EXE_.yourExt (type REG_DWORD) | Applications\NOTEPAD.EXE_.yourExt (type REG_DWORD) | ||
| Line 55: | Line 55: | ||
* "In Windows 10 to add the program to the "Defaults Programs" list, the program should have the "CompanyName" in resources." - [https://answers.microsoft.com/en-us/windows/forum/windows_10-other_settings/how-to-add-my-own-program-to-the-list-of-default/cd1d1305-9870-4156-9b99-fc03b40c1fc9 Nazaury] | * "In Windows 10 to add the program to the "Defaults Programs" list, the program should have the "CompanyName" in resources." - [https://answers.microsoft.com/en-us/windows/forum/windows_10-other_settings/how-to-add-my-own-program-to-the-list-of-default/cd1d1305-9870-4156-9b99-fc03b40c1fc9 Nazaury] | ||
--> | --> | ||
===Key types=== | |||
'''Reg_SZ''' | |||
* Standard string | |||
'''Reg_EXPAND_SZ''' | |||
* Allows system variables like in <code>"'''%SystemRoot'''"\Notepad.exe %1</code> | |||
* When used it expands to become an actual path. | |||
'''Other''' | |||
* https://docs.microsoft.com/en-us/windows/desktop/sysinfo/registry-value-types | |||
===Terms=== | ===Terms=== | ||
* The H in abbreviations stands for Hive. | * The H in abbreviations stands for Hive. | ||
Revision as of 08:26, 8 May 2019
Research
General
- HKEY_CLASSES_ROOT is a merged view of the ...\Software\Classes sub hierarchies in
- HKLM (HKEY_LOCAL_MACHINE)
- HKCU (HKEY_CURRENT_USER)
- HKCU is a mirrored view of HKEY_USERS\<User-SID>
- Adding a Key to HKEY_CLASSES_ROOT\Software\Classes will add a key in HKEY_LOCAL_MACHINE\SOFTWARE\Classes and vice versa.
Minimum requirements for new file types
- HKEY_CLASSES_ROOT\.[yourExt]\shell\open\command
- this command must have a Default key that is of type REG_EXPAND_SZ
- creating this manually gives a REG_SZ type, which will not work and cannot be changed within the regedit GUI
- REG_EXPAND_SZ type can be created with reg files and programmatically
Mind already existing alternate hierarchies
- HKEY_CLASSES_ROOT\.[yourExt]
If not empty, this key might have data such as extfile which will point to HKEY_CLASSES_ROOT\[extfile]
The second key then looks like this in full length:
- HKEY_CLASSES_ROOT\extfile\shell\open\command
Such structures sometimes get automatically created:
- HKEY_CLASSES_ROOT\ext_auto_file\shell\open\command
User overrides
The following will override HKEY_LOCAL_MACHINE keys as the HKEY_CURRENT_USER has a higher priority.
So, you can also think of HKEY_LOCAL_MACHINE keys as a fallback when HKEY_CURRENT_USER are removed again.
Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.yourExt OpenWithList OpenWithProgids UserChoice
If you set a default program for a file type, "UserChoice" will be created and point to that program and its (shell) context menu.
Better do backup and restore it when your own changes get uninstalled.
System overrides (backups) ?
Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ApplicationAssociationToasts Applications\NOTEPAD.EXE_.yourExt (type REG_DWORD) other_extension_.yourExt (type REG_DWORD)
Key types
Reg_SZ
- Standard string
Reg_EXPAND_SZ
- Allows system variables like in
"%SystemRoot"\Notepad.exe %1 - When used it expands to become an actual path.
Other
Terms
- The H in abbreviations stands for Hive.