The information in this topic pertains only to applications developed in C++.

If you are migrating to the current version of DirectPlay from the version that was part of DirectX version 3.0 or later, you do not have to make any changes. However, you should upgrade your application to use the new IDirectPlay4 or IDirectPlay4A interfaces.

Some system messages were changed in DirectX 6.0, with new data members added to the end. These new members are continued in the current version. Applications that need to be backward-compatible with older run-time files should do one of the following:

• Compile with the DirectX 3.0 header files and libraries.
• Avoid any references to new data members.
• Test with both the DirectX 3.0 and the current run-time file.

The system message structures that had new members added for version 5.0 were: