The OLD file extension is usually used in conjunction with a backup copy of a particular file. It is added to the filename when a newer version of that file has been created, to signify that the file is the OLDer version.
These files are mostly created atomically by the software application, but can also be created manually.
.old File Extension
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什么是 old 档案以及打开它的方法 - Backup File
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