Long File Name Support in Watcom Compiler

Question

I'm using Watcom C32 Optimizing Compiler Version 11.0.

I developed a sample program test.exe. This will create a file with long file name (ex: "sample file for testing.txt") and write some dummy content in it.

#include <stdio.h>

int main(void)
{
    FILE *fptr = fopen("e:\\sample file for testing.txt", "w");
    
    fprintf(fptr,"test");
    fclose(fptr);

    return 0;
}

When I compile and execute the program on a FreeDOS environment with DOSLFN loaded, I see that the sample program test.exe is creating a file with short file name ("sample f.txt") instead of long file name ("sample file for testing.txt") .

So that makes me to think that Watcom is not supporting the Long file name(LFN).

Any suggestion to make the LFN to work in Watcom? I looked at the compiler option and didn't see any. Is there any special macro needs to be enabled to make it work?