Use iTunes to Share Excel Files Between Windows and iPhone/iPad

I've been using iTunes on my Win platform for many years. I still buy music there, and I transfer it, along with my Outlook calendar to my iPhone/iPad. I use MS Excel a lot and transferred Excel files from my PC to my Apple devices with the 'File Sharing' feature in iTunes.

At one point several years ago there was some type of note that Apple may stop allowing the transfer of the Outlook calendar info to the iPhone, so I stopped updating iTunes. A few days ago I was a bit aggressive in trying to update a device driver on my PC, and I bricked it. While I had a viable system backup I could use, I went for a Win11 refresh which kept all my user files in tact. I was back and running with less than 6 hours of work. I have no idea what version of iTunes I had been using.

The problem was that I had to download an iTunes update (version 12.13.6.1). It picked up all my iTunes files just fine. However when syncing just now I looked at the File Sharing option, and Excel is not listed as an app that can be shared. I have Excel on my phone and PC. I can't find a way to add the Excel app to the list of apps in File Sharing. I liked that route for file sharing as opposed to cloud solution.