Just saw this. Thanks very much Ian. Yes it did seem bizarre, and fortunately it hasn't occurred on my laptop, where I also loaded Affinity. But something strange has undoubtedly happened. Besides showing the Affinity icon, the files are described by Windows Explorer as "Type: Affinity Photo file". That may only have meant that AP had become the default programme for opening them, as you say. I've now acted on suggestion, and set LR as default for this type of file. LR now wants to add them to the catalogue, which I take to mean it wants to reconnect with them. It's going to be laborious but my guess is that it will work, so thanks again. I'll post to confirm when/if it's sorted out.