Great you could make it work partly!

Here's a SH3D file where I replaced the image "2" by "sea.jpg", used as a texture of a simple box.
Then I removed the obsolete [font=courier new]catalogId[/font] attribute, removed [font=courier new]ContentDigests[/font] and [font=courier new]Home[/font] files, saved the SH3D file and it worked like expected. You're probably very close to a working solution.

Maybe we could get more information about the opening error, if you shared the error logs: just run the program from a Terminal window to get it (under Windows, add [font=courier new]2>log.txt[/font] after [font=courier new]SweetHome3D.exe[/font] to send error logs to the file [font=courier new]log.txt[/font]).