Unformatted External Hard Drive Now Not Navigable in Finder

All,
I have an external hard drive that was originally formatted in FAT32.
I had files on the hard drive that I did not want to lose and chose not to format it when Time Machine tried to do its thing.
Nevertheless, unlike other external hard drives that I use, this one now shows a "Time Machine hard drive" icon on my desktop.
When I open finder, the hard drive shows up and I can even double-click on the icon to see the files and directories that I have.
However, when I try to open one of those files or directories, the finder window "crashes" taking me back to the desktop.
If I keep the hard drive plugged in long enough, I'll eventually get a "Time Machine Error" message saying, "The backup volume is not in Mac OS Extended (journaled) format, which is required."
I'm fine with Time Machine not working on this HD, but not fine with not being able to look through the hard drive.
Can I get rid of whatever Time Machine tried to do to it and get it back to normal?
Thanks!

In the TM Pref panel simply slide the OFF-ON switch to OFF.

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