Fix Permissions for private key in OpenSSH ssh-add for Windows 10

fix.ps1

# Courtesy: https://superuser.com/a/1329702
# Set Key File Variable:
  New-Variable -Name Key -Value "$env:UserProfile\.ssh\id_rsa"

# Remove Inheritance:
  Icacls $Key /c /t /Inheritance:d

# Set Ownership to Owner:
  Icacls $Key /c /t /Grant $env:UserName:F

# Remove All Users, except for Owner:
  Icacls $Key  /c /t /Remove Administrator BUILTIN\Administrators BUILTIN Everyone System Users

# Verify:
  Icacls $Key

# Remove Variable:
  Remove-Variable -Name Key