Unknown 'Invisible' File Types

Hi,
Just joined this forum - having viewed it for many months.
You guys usually answer my questions without me having to ask but now I'd like some help if possible?

I found files with these names in my side-bar:

.de0129.2d6
.de0129.2cd
.de0129.2ca

etc.

I think my wife dragged them there by accident when she was using iPhoto.
They are now in my Wastebasket but can't be seen and cannot be deleted as they are still in use.

Any idea what they are and how to put them back to their proper place?

 

Thanks for the quick response yeroen,

I tried what you said but as the files are in invisible and in the trash, I can't move them anywhere.

I managed to cd to this:

~/.Trash/.de0129.2d7/.de0129.2d6

but when I tried your command, it says

-bash: fuser: command not found

Sorry to be a pain, but any other ideas? (I managed to find out that they were last opened on 5 Feb 2007 - so I'm obviously not using them much!)

Thanks again