Hi Leo,
After several weeks of scouring to learn what I could about preview handlers, I learned the following
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My old version of Quickview Plus ($49 in the past) will not function in Windows 10
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They offer a new version for $99. BUT - that's per year. And it does not work with any file managers. You have to run the program in its own window to read the files.
I find to hard to understand who would buy that.
Then I learned that WP-X8 suite which I did purchase has preview handlers built in for all their file types. I currently installed WP-X5 to allow me to install all my customizations from my old machine. The new version will also be installed soon, and the preview handler will work in Windows Explorer (which I don't use) and Opus