如果该文件存在，安装程序在更改前会创建一个备份。
If the file exists, the installer creates a backup before making the changes.
如果该文件存在，那么可以通过复制获得目标文件的备份。
If it does, then a copy is carried out to take a backup of the destination file.
如果该文件确实存在，那么您可以就其区分大小写的名称到底是什么进行很好的猜测。
If the file does exist, then you can have a pretty good guess as to what its case-sensitive name might be.
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