What Is This File & Why It Show UP In My Hard Drive Directory???

Hey mac people,
please help, this is serious problem!!!
recently, I found this file in my hard drive directory(picture below)(name: mach_kernel)
I not sure what is it, it is an UNIX file, why is it there? should I delete it?
before this I done a clean install, and now I'm moving back all the app by myself restore from time machine also download some from mac app store.
and I try to install all the loop and sound file for the garageband, it keep said close and reopen garageband to download, but it never let me download, it keep show up same message everytime I open it!! is this because the UNIX file problem?
all my apps:
the garageband problem message:
thanks everyone! please reply me as soon as possible!!!

Hey guys,
Just now I searched google,
and it showed up that this is a system file should not be deleted, and apple have an command line code to hide it
website:
https://support.apple.com/en-ap/HT203829
code for terminal:
sudo chflags hidden /mach_kernel
after I done that, it disappear! but can someone explain to me why it happen? because seriously I want to know, if I done anything wrong to my mac??
or some app I should not install?
I downloaded the latest security update, could this make it appear? or I have downloaded google earth and earth pro but interface not great so deleted it, will it make it appear too?
thanks for help!!!

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