Apple IIe and control characters in file names

["David Boyer" <david@bvu.edu>]

As I recall on the IIe, you can use control characters in a filename which
aren't visible but are part of the filename. You can, however, run a program
which causes the IIe to display the control characters as inverse
characters.

Does anyone know how to do this?

I saved my HighSchool BASIC project on a floppy in the 80's using control
characters in the filename. I just got a IIe, and now I'd like to open the
project for nostalgic reasons. It seems like the program we used to use to
display the control characters was only a couple lines long, but it's been
14 years ago!!

Any help is appreciated.