How to open an unknown file? - ZTE

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How to open an unknown file?

If you click an unknown file, a message box is displayed, asking you to open the file. The file icon contains? The app may not be installed on your mobile phone. You need to enter the App Store to download and install the app. If you are not clear about which apps can be opened, it is recommended that you search for the suffix of this file on the Internet first.

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