How to set pagefile via GPP

Hi there,

I want to add manuel set pagefile-size via GPP. So I've added the following keys:

HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management
Value type: REG_MULTI_SZ 
Value Name: PagingFiles
Value Data:D:\pagefile.sys 15360 24576

Value type: REG_MULTI_SZ 
Value Name: ExistingPageFiles
Value Data: \??\D:\pagefile.sys

But when I take a look at the servers pagefile-configuration, it showes me not the 
above described custom size but:

System managed size
Recommned: 18430 MB
Currently allocated: 12287 MB

The VM has 24GB of RAM. The RegKeys are right set to the VM.