I need help getting server 2008 R2 to recognize (.wri) as a printable document

I have been using the .wri extension on all of my created invoice documents so they open and are displayed better using wordpad but now I have the need to print batches of them and am having issues.

The problem is in the popup menu when right clicking on them, there's just no print option displayed with that extension.

I could change the extensions to .txt but I have over ten thousand invoices to print so it's probably going to be easier to get windows to recognize that extension as a printable document I would think/hope.

Mike