struct File. property size.

[AntonSotov via Digitalmars-d-learn]

import std.stdio;

int main()
{
    auto big = File("bigfile", "r+"); //bigfile size 20 GB
    writeln(big.size);  // ERROR!
    return 0;
}
//////////////////////////////////////
std.exception.ErrnoException@std\stdio.d(1029): Could not seek in 
file `bigfile` (Invalid argument)

I can not work with a large file?
32 bit executable.