First Defence and Dan,
Thanks for your suggestions.
When trying to follow the steps from First Defence's video (See Capture and Capture 2), I clicked the Affinity Design app. It showed a blue loading circle, and then nothing happened. "Capture" is from right clicking, and "Capture 2" is with double clicking the file.
I then proceeded to follow the steps from Dan's video, as seen in Capture 3, 4, and 5. I found the Affinity files in Default programs>file by type. Instead of the Affinity logo, there was a blue square and when I clicked it it said there is no installed app. Continuing to the app store prompts me to purchase Affinity Designer. I did not see options for logging in or reclaiming something that I had already purchased.
I can open Affinity Designer from my Task Bar and create a new file, and it can be saved. But I cannot reopen any files.
Thank you again for your help in trying to solve this. I really have no idea what happened. I'd appreciate any additional ideas that you might have. I hope the information I included is helpful.
Thank you again!
Corinne