Can't use -R on a folder on windows

The analysis starts with the function process_file.
If the path provided is a directory with the flag -R the result is that nothing is processed when the execution reach line 1106 of engine.c

if(S_ISDIR(fstat.st_mode)) {
/* Need to error catch here.*/
if( flags & RECURSIVE_FILE_SCAN ) {
process_directory(filename,forcelang);
return;
}
}

S_ISDIR will return true for the root folder where the analysis was requested but the flag will tell to not do a recursive scan (not even on the root) so all is skipped and the if at line 1114 will terminate the process printing NOT REGULAR FILE.