Do you think this is a problem with MacOS Mojave? Please help me.
No, this is not a problem with macOS Mojave. I've seen this before and it was caused by an app hiding within the Library folder.
Unfortunately I don't recall the app, but I do recall how we got to the bottom of it. In summary:
- Install EasyFind (it's free from the Mac App Store)
- Search for SystemExtr
- Identify the file (app) responsible
- Remove it
As mentioned, from memory it was sitting in the Library folder.
NOTE: I am in no way affiliated with EasyFind.
if you click on the report button you will see the location of SystemExtr. I had also the same problem and mine was located under
~/Library/SystemExtr so I removed the whole folder and it stopped to show up anymore.
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protected by Community♦ Dec 16 '18 at 18:56
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