Dev-C++ doesn't accept RCDATA!

When I attempt to compile:

ABOUT RCDATA "about.txt"

Dev-C++ returns the error: Invalid syntex error.
I have followed many different examples an none of them work. Why won't Dev-C++ compile RCDATA data?

Assuming that ABOUT is properly defined, you would need to enclose the data in braces, i.e.,:

Code:

ABOUT RCDATA 
{
"about.txt"
}