attachments for old emails don't show up in outlook

Hi,

Upgraded both our Desktop & Laptop to Windows 10 in the past few months.
Last week I tried to access some Outlook emails that were more than two years old, the attachments & emoticons do not appear. This is on both PC's & the same result using Edge, IE or Chrome.

I installed Windows Live Mail & now I can see all the attachments & emoticons. Forwarded some of the emails from Live Mail to myself & now in Outlook the attachments/emoticons all appear as well (all three browser Edge, IE & Chrome). So say for instance I have a 2 & 1/2 year old email in a Outlook folder that will not display attachments/emoticons but the very same email just forwarded from Live Mail to my Outlook inbox now displays all attachments & emoticons

Tried inspecting elements but really have no idea what I'm doing. See msgs regarding HTML, Java Script in Edge? Don't have either Java or Silverlight installed, guess the newer browsers are moving towards HTML.

So can anyone help me to understand what is happening?

Thank you as always

When I inspect element on these pictures & emoticons it looks to me as if they are associated img file type.
According to the Default File Type Associations - Restore in Windows 10 Tutorial I see img file type has a description of CD or DVD image file no Default App.

So grasping at straws here am wondering if I point the .reg for img to Microsoft Edge as the html file types are - might that possibly open the pictures inside Outlook? How would I point img file type to Microsoft Edge?
In fact when I browse Choose Default Apps by File Type in Settings I cannot find .img? Goes right from .imesx to .inc. Should there be .img there?

Not very good with registry, sorry.

thank you