This is all about support for the Olympus programme and not much else. It really doesn't matter if it's XP or a desktop PC.

I see they list this programme at https://www.olympusamerica.com/crm/oneoffpages/crm_master_tips.asp as well as a support page. I'm not writing they will actually support it but there are articles there about the programme's use that would be reviewed in hopes of finding out why it's not working.

Let's drill down on something you wrote. You wrote "If I open one of the photographs now I can only use the Microsoft editing tools."

Sometimes I find users that are not aware of File Associations in Windows. That is, what programmes or Apps are to be used when we double click on a file.

In short, why not try associating your photograph's file with the Olympus app?

There are many articles about that so here's one. https://www.google.com/search?client=opera&q=Windows+XP+how+to+associate+a+file+type+with+a+program