https://issues.dlang.org/show_bug.cgi?id=14469
--- Comment #1 from Kenny Alive <artemal...@gmail.com> --- Additionally since ReadFile (and ReadFileEx too) can read file in chunks not larger than 4GB the file reading code should be updated to something like this: ulong totalNumRead = 0; while (totalNumRead != size) { uint chunkSize = (size - totalNumRead) & 0xffffffff; DWORD numRead = void; cenforce(ReadFile(hFile, cast(ubyte*)lpBuffer + totalNumRead, chunkSize, &numRead, null) != 0 && numRead == chunkSize, name); totalNumRead += chunkSize; } --