I have this app called Search Everything[0]. Allows you to search everything on your PC (I use Win10).
The other option is using cmd prompt:
DIR C:\myfile.txt /S
No idea how with PowerShell
The other option is using cmd prompt:
DIR C:\myfile.txt /S
No idea how with PowerShell
But yeah, there is nothing better then Everything, on any OS.
you can use this to look in files on windows