Using IUCLID, you might be able to recover data from a I5D IUCLID XML backup file and afterwards export them to a I5Z file.
Convert IUCLID XML backup file to IUCLID import or export file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert i5d to i5z on Windows
An international uniform chemical information database software
Convert from i5d file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.