KB150199 - DOC: ThreadingModel Is Not a Subkey

SUMMARY

For thread-aware DLL-based or in-process objects, you need to set the threading model in the registry. The default model when you do not specify a threading model is single-thread-per-process. To specify a model, you add the ThreadingModel subkey to the InprocServer32 key in the registration database.

For thread-aware DLL-based or in-process objects, you need to set the threading model in the registry. The default model when you do not specify a threading model is single-thread-per-process. To specify a model, you add the ThreadingModel named-value to the InprocServer32 key in the registration database.

MORE INFORMATION

To set the threading model, perform these steps:

Run Regedit in Windows 95, or run Regedt32 in Windows NT.

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys And Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it. If you are running Windows NT, you should also update your Emergency Repair Disk (ERD).
Choose the HKEY_CLASSES_ROOT folder, and then choose the CLSID folder.
Find the GUID for the object you want to enable with apartment-model threading. Then expand the object's folder.
Expand the InprocServer32 key.
From the Windows 95 Edit menu, select New. Then select String Value, and type ThreadingModel. Select the name just typed from the Edit menu, select Modify, and type Apartment for Value data.

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From the Windows NT Edit menu, select Add Value. Type ThreadingModel for the Value Name. Click OK, and type Apartment for the String value.