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Update asyncfile.nim: support write to > 2GB file on Windows #25105

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@foldl foldl commented Aug 17, 2025

DWORD is defined as int32, so DWORD(...) would not work as expected. When writing to files larger than 2GB, exception occurs:

unhandled exception: value out of range: 4294967295 notin -2147483648 .. 2147483647 [RangeDefect]

This PR is a quick fix for this.

P.S. Why DWORD is defined as int32?

`DWORD` is defined as `int32`, so this would not work as expected. When writing to files larger than 2GB, exception occurs:

```
unhandled exception: value out of range: 4294967295 notin -2147483648 .. 2147483647 [RangeDefect]
```

This PR is a quick fix for this.

P.S. Why `DWORD` is defined as `int32`?
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See also #12327

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