I also have everything as portable on my system to quickly search for whatever.
I use xnviewmp as my direct to go program where I sorted my files and it shows most if not all thumbnails.
All files are on my NAS and also backed up, just add a shortcut to open with or drag/drop to the programs UI would open too.
This not only Xara related but i do this with all assets from my other programs as I like my programs environment to be as lean as possible to avoid overhead in its usage.