// GetPrivateProfileString() の概略
HANDLE h = CreateFile(lpFileName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
LockFileEx(h, 0, 0, 0xffffffffUL, 0, NULL);
QueryStandardInformationFile(...);
ReadFile(...);
UnlockFileEx(h, 0, 0xffffffffUL, 0, NULL);
CloseFile(h);