Open your netlist in a text processor.
Each line contains a component, source, meter, etc.
You're searching for anything that looks like garbled data. If it looks faulty, delete it. By removing data which is faulty (or might be faulty), you may eventually succeed in restoring your schematic to a form which is readable.
If all lines appear okay, then it might help to delete the most complicated components in your schematic when it crashed. It might be able to work if you give it a simplified schematic.
As you save your netlist, you must avoid turning it into a format of the program you're saving it from. Also, you must not change the extension (3 or 4 letters at the end of the file name).
Your schematic will be incomplete. You'll have to add back the missing components.