Some computers have been optimized, and files created under the system have no extension. When you want to change the file format, it may be a bit of a hassle, because you can't find it, you have to set it up.
1. Open “My Computer" Click “Order>; select the folder and search options.
2, in the folder options, remove “ hide the extension of the known file type & rdquo; check the tick, click & ldquo; OK & rdquo;.
After the setting is completed, the original file format of the file is displayed.
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