Using variables with a space in its name with Text File Operations plugin

[t3knoid]

I can't seem to get access to the value of a variable with a space in its name. I am trying to use the Text File Operations plugin. I tried the following formats:

VMName,${ENV,var="Virtual Machine Name"}

VMName,${Virtual Machine Name}

I can only get this to work if I use a variable without spaces and using the second format shown above (e.g. ${VirtualMachineName}. I prefer using the space because the Jenkins uses the variable name in the GUI as well.

[t3knoid]

I printed the environment using a SET command (I'm using Windows). It shows all the environment variables with spaces just fine. In fact, when I created a batch script with references to the variables, %Virtual Machine Name% for example, it evaluates correctly. This sounds more like a bug in the Text File Operations plugin.