Ok, then why does this work. Compiled in IDE, executed in an exe

A #defined constant is just a text substitution, there is no evaluation at compile time

#define RUNNING_IN_IDE !empty(Version(2))

?'ide',  RUNNING_IN_IDE
? [RUNNING_IN_IDE]

>Yes.
>
>#DEFINE is a precompiler directive and will only be evaluated at compile time.
>
>>Are you sure ?
>>