Specifies whether or not an application uses a custom handler.
Registry Entry
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    \InprocHandler32 = <handler.dll>
Value Entries
Remarks
If A custom handler is not used, the entry should be set to OLE32.DLL, as shown in the following example.
HKEY_-CLASSES_ROOT\CLSID\{00000402-0000-0000-C000-000000000046}
    \InprocHandler = ole32.dll 
 
If a container is searching the registry for an InprocHandler, the 16-bit version has priority with a 16-bit container, and the 32-bit version has priority with a 32-bit container.
See Also