You can use the Rename dialog with a user script. The following code works for me. Click the Edit button then replace the template code with the code below.
function OnGetNewName(getNewNameData)
{
var str = getNewNameData.item;
var a = str.name_stem.split("");
var a_rev ="";
for (var i = 0; i < a.length; i++) a_rev = a[i] + a_rev;
return a_rev + "." + str.ext;
}
Regards, AB
