Solved
Luc is unfortunately right.
The file in the archive consists of 4808988 bytes which are all zero (this makes for a very good compression and is responsible for the very small archive size which Luc had noticed) . So there is no information in this file which could be recovered and your only hope is that you have a backup lying around.
We have heard here quite a few times about this effect with Prime files getting damaged. Seems the program is not really reliable which means one must make more backups than with other software to be on a safer side.
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