I'm new to tinkering with app.config and xml, and am currently doing some refactoring in some code I haven't written.  

Currently we have a snippet which looks like this: 

```
<setting name="FirstSetting" serializeAs="String">
  <value>Data Source=C:\Documents and Settings\All Users\ApplicationData\Company ...;Persist Security Info=False</value>

```

What I'd like to do is have it instead point to something like `${PROGRAMDATA}\Company\...`

How can I achieve this, keeping in mind that PROGRAMDATA will not always point to `C:\ProgramData` ?