How to include header files with different extensions

Hi,
When i include a header file with extension .ch (myincludefile.ch), the compiler gives error messages but when i change the extension to .h, the problem disappears.
Can anyone help me getting rid of this problem?
For example, for the line below, I get a warning such as, "attempt to redefine MY_CONST without #undef". Remember when i change the extension to .h, the problem disappears.
#define MY_CONST 500 /* Constant */
Thank you very much

I don't see how the name of the file could cause or prevent error messages, except when template declarations are involved. So let's assume for now that the file has a template declaration.
The Templates chapter of the C++ Users Guide explains about including or separating template declarations and their definitions.
If you have only a template declaration in a file and the compiler needs the definition, it will look for another file with the same base name and include it automatically. For example, if you have files foo.h and foo.cc, and foo.h has a template declaration, the compiler will include foo.cc automatically, even if you didn't intend for that to happen. You can wind up with multiple delcaration errors that way.
When looking for a file containing template definitions, the compile will not include a .h file, so as not to create recursive inclusion. If changing the file name to .h causes your problem to disappear, it seems like an unwanted automatic inclusion is the problem.
You can try two things to find out:
1. Compile with the -H option. The compiler will output an indented list of all included files. See if you are getting a file you didn't intend, or the same file twice.
2. Compile with option -template=no%extdef. It disables the automatic search for template definitions.
If you find an unintended included file this way, you will probably have to change the names or organizaiton of some of the files. Our implementation of the C++ standard library depends on NOT using the -template=no%extdef option, which might mean you can't use that option.

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