Search notes:

C:\Users\username\Documents\WindowsPowerShell

In PowerShell Desktop running in Windows, this directory corresponds to the value of $profile: 
PS>write-host $profile
C:\Users\rene\Documents\WindowsPowerShell\Microsoft.PowerShell_profile.ps1

See also

The subdirectory Modules
The parent directory Documents
C:\Users\username\Documents\PowerShell

Index