When opening your GeoStudio analysis file, you get the following message:
The GeoStudio .gsz file is a compressed file that contains all of the necessary component files. It is the same compression as a standard .zip file. You can try renaming the file extension to .zip and try opening the file with an unzip utility or the Windows file system.
If the file is corrupted, you can try repairing it with many of the zip repair utilities available. Simple do an internet search for zip repair utility. GEOSLOPE does not recommend one utility over any other.