here is what i create but its not working.

<If description="Procedure description: Checks if the the TileDataLayer Folder exists if not creates it.">

<Condition name="TestFile">

<Parameter xsi:type="StringParameter" name="Path" value="C:\WINDOWS\system32\config\systemprofile\AppData\Local\TileDataLayer\nul"/>

<Parameter xsi:type="EnumParameter" name="Condition" value="Exists"/>

<Parameter xsi:type="StringParameter" name="Value" value=""/>

</Condition>

<Then>

<Statement name="WriteScriptLogEntry" continueOnFail="false">

<Parameter xsi:type="StringParameter" name="Comment" value="TileDataLayer already exists"/>

</Statement>

</Then>

<Else>

<Statement name="Execute Powershell" continueOnFail="false">

<Parameter xsi:type="StringParameter" name="Parameter1" value=""/>

<Parameter xsi:type="StringParameter" name="Parameter2" value="mkdir C:\WINDOWS\system32\config\systemprofile\AppData\Local\TileDataLayer\Database"/>

<Parameter xsi:type="StringParameter" name="Parameter3" value="False"/>

</Statement>

<Statement name="WriteScriptLogEntry" continueOnFail="false">

<Parameter xsi:type="StringParameter" name="Comment" value="TileDataLayer folder created"/>

</Statement>

</Else>

</If>

</Body>

</Procedure>

</ScriptExport>

Try using "Execute Commandshell"  instead of "Execute Powershell"