Support for registration-free COM interop varies slightly depending on the type of library assembly; specifically, whether the assembly is unmanaged (COM side-by-side) or managed (.NET-based). The following table shows the operating system and .NET Framework version requirements for each assembly type.
Assembly type | Operating system | .NET Framework version |
|---|
COM side-by-side | Microsoft Windows XP | Not required. |
.NET-based | Windows XP with SP2 | NET Framework version 1.1 or later. |
The Windows Server 2003 family also supports registration-free COM interop for .NET-based assemblies.
For a .NET-based class to be compatible with registry-free activation from COM, the class must have a default constructor and must be public.
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