There are default apps that open certain types of files in macOS Mojave. However, you can change this. To open a file once with a specific app, do one of the following:
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Drag the file onto the app icon in the Finder or the Dock.
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Select the file in the Finder, choose File > Open With, then choose an app.
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Control-click the file, choose Open With, then choose an app.
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Open the app, then choose File > Open.
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To permanently change the app used to open a file
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In the Finder, select the file, then choose File > Get Info.
You can also Control-click the file, then choose Get Info. -
In the Info window, click the disclosure triangle next to “Open with.”
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Click the pop-up menu, then choose the app.
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To open all files of this type with this app, click Change All.
