Please read carefully what I wrote before.  The API for `fseeko` takes an `off_t` input, but `File.seek` in phobos directly passes a `long` into it, which only works because all the non-Windows platforms either happen to have `alias long off_t` or because `__USE_FILE_OFFSET64` is true by default on linux and Solaris.  Since that isn't the case on Android/x86, it breaks.

Not sure why you're questioning my "method of testing," when I noted earlier that this type mismatch caused a compile failure, apparently because of sloppiness in std.stdio.