When you compile an HTML Help project, you may receive the following HTML Help compiler warning:

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This is caused by characters in the include (.h) file that are not recognized by the compiler, such as tab characters.

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Edit the include file so that there is exactly one space between each #define statement and what it is defining. Do not use tab characters.

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Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

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When you create an HTML Help project with context IDs, it is possible to put the context ID's in a separate include (.h) file and include the file by specifying it in the [MAP] section of the project. In this file, there must be exactly one space between the #define statement and the defined constant, and you cannot use tabs. You can use tabs elsewhere in the file.

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