CX-Programmer Unable to Open File

[LD_M 2]

Hello,

I have the original back-up plc software, from the machine supplier. When I tried opening with CX-Programmer, there are errors and the project file could not be opened.  

The list of errors are..

1.ERROR: Item key 'CXProgVer': String attribute not found
2.WARNING: Item key 'CXProgVer': Assigning default string
3.ERROR: Invalid file version.

Is the file corrupted? or I need to downgrade the cx-programmer software, since the machine program was 10 years ago ( as mentioned by the manufacturer ).

Thanks for your inputs.

Cheers.