You can accomplish this now by including the output file name in the message body that you define for the e-mail message. Unfortunately if your filename is dynamic (e.g., including a date/time stamp like yours does) there's no way to get that value in there (because the variable/function value might change between when it's used for the file name and when it's used in the message).
What we need is a variable that you can insert in the message that will resolve to the file name used for the export. I though there already was such a variable, but I was wrong. If this approach will work for you, open a support case and we'll make the change to add the variable.
The other way of approaching this, which sounds more like what you had in mind, would be to add an option that you can check and Report Commander will automatically create a message with links to the files, without you having to construct the message yourself.