I have a client that sends files to organizations with time sensitive data. She doesn't want folks to be able to open the file after a certain date that she specifies. These files are simple Excel files, but could be PDF, DOC, or even ZIP files. She wants a program she can run, select a file she will send, and specify in the application that the selected file should lock itself so it can't be opened in 10 days. Then she wants to send that file to these organizations.