This could be a problem with your browser (e.g. Edge/IE) renaming / changing the mime-type of the .sh3f library. Try changing the extension (from .zip) to .sh3f (and you could try to move the .sh3f file manually to where the libraries are stored - possibly [font=courier new]C:\Users\<your-user-name> \eTeks\Sweet Home 3D\furniture[/font] - and restart SH3D). ok