Starting in 010 Editor v3.1, the #define, #ifdef, #ifndef, #else, #include etc. keywords
are supported (in version 3.0 and before, only the #include keyword was supported).
If you are using 010 Editor v3.0 or before, constants can only be defined using
the 'const' keyword like this:
const int NUMREC = 16;
Note that the #if keyword and macros defined using #define are currently not supported.