Inserted Images are lost when rezipping a ggb file
The ggb file is actually a zip file. Renaming the ggb file to a zip file allows for changing the geogebra.xml file inside to make some global adjustments quickly. Afterwards creating a zip file again and renaming it back to ggb should pose no problem.
However, there is a problem when the ggb file contains an inserted image. Inserted images are stored in a directory inside the ggb file. When the ggb file is extracted as a zip file, and a new zip file is created from the output and renamed to a ggb file, the image is lost! Please try the Test.ggb attachment and TestRezipped.ggb.
Your unzipper will reveal that they have equal contents. Save the opened TestRezipped.ggb from within GeoGebra and the output file will not contain the directory anymore.
Does anyone know a way to create a valid GeoGebra zip/ggb file by some Windows archiving program?
I think this is a bug. Please rewrite the ggb file Loader to accept standard zipfiles. Inserted images should be preserved.