Sorry folks, been away for a few weeks.
Just wanted to say thanks for the suggestions...
I looked into DELmem and Justin Tadlock's Member plug-in, both look like very good candidates. But since I only have to secure access to a few files for a handful of people I will try to keep it simple with a password-protected page.
Dave I appreciate your note about security concerns using WP password-protection. Good to know. Our data files are not super sensitive (schedules etc.) so I am not too worried. But I'm glad you brought it up in case we ever have a requirement to secure more sensitive information.
Again, many thanks for the feedback!