Registry Functions

OS/2 supports the following predefined key handles:

• HKEY_CLASSES_ROOT
  
• HKEY_CURRENT_USER
  
• HKEY_LOCAL_MACHINE
  
• HKEY_USERS
  
• REGH_INIMAPPING
  
• REGH_SYSINFO
  
• REGH_WINOS2INI

For HKEY_LOCAL_MACHINE, OS/2 accepts and converts only the following list of subkeys:

• All new keys added under HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS and NT\CURRENTVERSION\INIFILEMAPPING is added to REGH_INIMAPPING. 
  All references to HKEY_LOCAL_MACHINE\SOFTWARE are mapped to REGH_WINOS2INI (application's data).

  OS/2 does not support REG_LINK and REG_RESOURCE_LIST value types.

  The registry supplies mappings for the following subkeys:

  ┌──────────────────────────────────────────────────┬──────────────────────────────┐│HKEY_CLASSES_ROOT\ ... (alias to                  │REGH_SYSINFO\Classes\ ...     │
  │HLM\Software\Classes)                             │                              │
  ├──────────────────────────────────────────────────┼──────────────────────────────┤
  │HKEY_CURRENT_USER\Software\ ...                   │REGH_SYSINFO\User\Current\ ...│
  ├──────────────────────────────────────────────────┼──────────────────────────────┤
  │HKEY_LOCAL_MACHINE\Software\ ...                  │REGH_WINOS2INI\  ...          │
  ├──────────────────────────────────────────────────┼──────────────────────────────┤
  │HKEY_LOCAL_MACHINE\Software\Classes\ ...          │REGH_SYSINFO\Classes\ ...     │
  ├──────────────────────────────────────────────────┼──────────────────────────────┤
  │HKEY_LOCAL_MACHINE\System\CurrentControlSet\ h.   │REGH_SYSINFO\Control\ ...     │
  │...                                               │                              │
  ├──────────────────────────────────────────────────┼──────────────────────────────┤
  │HKEY_USERS\.Default\ ...                          │REGH_SYSINFO\User\Default\ ...│
  └──────────────────────────────────────────────────┴──────────────────────────────┘
  

  Notes:

  • HKEY_CLASSES_ROOT is totally unrestricted with regard to the first subkey and it is an alias to the information stored in the registry key HKEY_LOCAL_MACHINE\Software\Classes.
    
  • HKEY_CURRENT_USER must have Software as the first subkey.
    
  • HKEY_LOCAL_MACHINE must have either Software or System\CurrentControlSet as the first subkey.
    
  • HKEY_USERS must have .Default as the first subkey (note the period).

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