Do not depend on FileExists() when opening save files for writing #7696
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Because the
abfile mode doesn't outright fail when the save file already exists, it turns out a false negative result fromFileExists()can still wipe out a save file. The good news is thatGetFileSize()can't retrieve a valid value forsize_if an error occurs. Since we are querying the file size anyway, we can rely on that result to determine whether the MPQ we opened is a newly created file.