Talk:Windows Shell Extension: Difference between revisions
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Applications\NOTEPAD.EXE_.yourExt (type REG_DWORD) | Applications\NOTEPAD.EXE_.yourExt (type REG_DWORD) | ||
''other_extension''_.yourExt (type REG_DWORD) | ''other_extension''_.yourExt (type REG_DWORD) | ||
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* "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] | |||
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===Terms=== | ===Terms=== | ||
* The H in abbreviations stands for Hive. | * The H in abbreviations stands for Hive. | ||
Revision as of 21:38, 6 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
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)
Terms
- The H in abbreviations stands for Hive.