Mac Software Cannot Be Opened

Mac Software Cannot Be Opened

For macOS 10.14, 10.15 or later macOS versions, the users may encounter this issue when they are going to open a installed software from Launchpad, the issue is “xxxx can’t be opened because Apple cannot check it for malicious software.” For example.

Yesterday I had this problem while using my Mac. The Preview app stopped working suddenly. When I tried to open photos or PDF files, the file did not open and I was getting the same message saying “The file “macReports” couldn’t be opened.

Preview on Mac is the default image and PDF viewer app that lets you view and edit various file types including; PDF, JPEG, PNG, PSD, and TIFF.

See also: PDF Won’t Open: “Please Wait…” Message, How To Open

The Application Can't Be Opened

If you’re having trouble opening some of your photos or PDF files using Preview, and this article may help you.

Preview not opening files


Please try the steps below and after each step test to see if your issue is fixed:

Before doing anything, make sure that your Mac is up to date. Here is how:

  • On your Mac, click Apple menu > System Preferences and then Software Update. If there is an update available, click the Update Now button and the new software will be installed on your Mac. If you prefer, you can check the “Automatically keep my Mac up to date” to have your Mac update automatically.

1. Quit the Preview app and then re-open it. Here is how:

  • Open the Preview app
  • Click Preview in the menu bar
  • Click Quit Preview

Then now try to open a file that you could not previously open. If Preview does not quit, or if you could unable to quit the app, try force quitting the app. Note that doing so may cause you to lose unsaved changes if any. Here is how:

But, at 9PM, 10PM, or 3AM, you probably shouldn't be looking at the sun.f.luxf.lux fixes this: it makes the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day.It's even possible that you're staying up too late because of your computer. You could use f.lux because it makes you sleep better, or you could just use it just because it makes your computer look better. Ever notice how people texting at night have that eerie blue glow?Or wake up ready to write down the Next Great Idea, and get blinded by your computer screen?During the day, computer screens look good—they're designed to look like the sun. Mac app reduce blue light code.

  • Click the Apple menu in the menu bar
  • Click Force Quit or you may press the Option, Command, and Esc (Escape) keys together
  • This will reveal the Force Quit window
  • Select Preview in the window
  • Click the Force Quit button.

2. Restart your Mac. This fixed my problem. After restarting my Mac, I was able to open my files again using Preview. You can restart your Mac by going to Apple meu and Restart.

3. Restart your Mac in safe mode. Here is how:

  • Turn off your Mac
  • Turn on your Mac and immediately press and hold the Shift key.
  • Keep holding the Shift key until you see the login screen, then release the key
  • Log in (you may need to log in a few times)
  • Now your Mac is in safe mode. Try opening a file using Preview in safe mode, does it work?
  • Either case, exit safe mode by restarting your Mac normally (do not press and hold the Shift key)
  • And test again if the Preview app is working or not.

4. Open Disk Utility (Applications / Utilities) on your Mac. You can also use Spotlight to find and launch the app. Select your disk from the left menu and then click First Aid and then click Run. This will fix volume errors. Please note that this process may take more than one hour.

5. You may be having this problem because your Preview preferences files might become corrupt. Here is what you can do:

  • Quit Preview if it is running
  • Go to Finder
  • From the menu bar, click Go and Go To Folder
  • Enter the following and hit enter

Mac App Can't Be Opened

  • Now drag this file to Trash
  • Restart your Mac
  • And try opening your file.
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