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 catalogId attribute, removed ContentDigests and Home 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 2>log.txt after SweetHome3D.exe to send error logs to the file log.txt).
----------------------------------------
BoxWithManuallySetTexture.sh3d
(14395 bytes)
(Download count: 136)
(Box with a manually set texture)----------------------------------------
Emmanuel Puybaret, Sweet Home 3D creator
