Correct. It used to be that Perl supported (some) wide file apis, but they got dropped in order to support unicode on other platforms.

If you want to create a totally impractical path with 32k chars, compile and run this. (WARNING: It is a bitch to delete!)

#include <stdio.h>
#include <windows.h>

wchar_t path[ 32768 ] = L"\\\\?\\c:\\1234567890\\";
wchar_t name[] = L"1234567890\\";

int main( int argc, char **argv ) {

    while( CreateDirectoryW( path, NULL ) ) {
         wcscat( path, name );
    };

     printf( "Error %d\n", GetLastError() );;
}
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