Using variable value as part of file name

Lectora 2007 user.I'm having users select an item from a listbox and would like to use the variable created by the selection as part of a file name, then have Lectora play a particular sound file based on their selection.Something along this format "VAR(List_0001).wav", where VAR(List_0001) is the varible and ".wav" is a literal.It seems like a pretty straightforward function, but I'm at a loss in how to get it to work in Lectora. Any thoughts on how to do this?Or is this a Javascript function?

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