How to avoid the hold shift command to unable startup macros?

Hi,

So, I have an excel file that opens if a certain filepath on the computer is valid. If it is not valid the excel file will automatically close.

This code is dependent on the startup macro of the file.

I just realized that if someone opens the file while holding down shift, they unable this command completely and may use the file however they want.

Is there any way to avoid this? I mean, I thought about starting a timer as well that search for the file every 5 minutes, but that timer is also dependent on the startup macro.

Any way I can make my sheet more bulletproof and maybe avoid this silly shift-command trick?