Hallo, ich hatte dasselbe Problem in der Apple-Communitiy adressiert. Und nach längeren Diskussionen kam dort gestern der entscheidende Hinweis von Stephan_Joe..
Ich habe es probiert - App gelöscht und der Spuk ist verschwunden!!!:
This worked for me!
Since two weeks or so I was not longer able to open word files on my iPhone or my iPad. I do not possess a Mac.
Some nice guy called Minute_Path_4458 on reddit wrote that he recommends to delete the app
"Whereby" .
I did so and immediately was able to open MS-Word files again, not even a reboot was needed! So many thanks for the hint! Worked on iPhone and iPad!
Other users write that deleting "Viber" (which I do not have) did the same for them.
Also heard of deleting "Skype" and some other apps, please Google...
The problem came up in the moment my iOS/iPadOS devices installed the last "Pages" update some ten or more days ago. Seems that file associations of at least Word (and Excel...) get mixed up to the wrong apps and that has as a consequence not being able to open the according files! Good luck I did not use Whereby anymore