I finally got my little unzip and secure delete button working (thanks, nudel!), but now I've run in to another issue. The reason I wanted to automate this is that some of these zip files are very large and take considerable time to unzip. I didn't want to hang around waiting for the unzip to finish to then do the secure delete.
So tonight I select a zip, push the right button, it starts to unzip, and I go off to read some mail. I'm in the middle of typing a reply when the secure delete status pop-up grabs the focus (bad enough) and then interprets my space bar between words as an intended activation of the already selected "Abort" button. So I've finally got it automated and deleting the right files, and now it aborts because I'm in the middle of replying to an email when it steals the focus.
This whole stealing focus thing in Windows needs some serious attention -- and I'm talking about almost all Windows apps here -- but I definitely don't understand why the Opus status pop-up has to steal the focus and also have the "Abort" button already pre-selected and ready to be accidentally activated.