Java SE (Java Platform, Standard Edition)

I am attempting to set up a system deployment.properties file to enable system level caching for a java web start application I already have sucessfully running with user level caching.

I have created a deployment.config file with the following entries

deployment.system.config=c\:\\temp\\deployment.properties
deployment.system.config.mandatory="true"

I have created a deployment.properties file in c:\temp with the following entry
deployment.system.cachedir=c\:\\Documents and Settings\\All Users\\Application Data\\cache"


I run the following from the command line
c:\Program Files\java\jdk1.5.0\bin\javaws -system <my-jnlp-file>

java web start starts and I get the following error in Java Web Start

An error occurred while launching/running the application.

Category: Launch File Error

You can not run this program because your system deployment.config file states that an enterprise configuration file is mandatory, and the required: c:\temp\deployment.properties is not available.

It seems like the deployment.properties file is not being found - I tried to put in on the server but I had the same result.
If I set the mandatory property to "false" then the user cached version starts up ok.

Any help with this much appreciated