set theMacroGroup to make new macro group with properties {name:theMacroGroupName, available application xml:"<dict>
<key>Targeting</key>
<string>Included</string>
<key>TargetingApps</key>
<array>
<dict>
<key>BundleIdentifier</key>
<string>com.apple.mail</string>
<key>Name</key>
<string>Mail</string>
<key>NewFile</key>
<string>/System/Applications/Mail.app</string>
</dict>
</array>
</dict>"}