How do I open a file from version 6.1 in version 6.0?

Hi all,

I have been sent files but cannot open them due to the following message:

"

The document could not be imported:

Failed to import document from C:\Users\LabAdmin\Documents\Materials Studio Projects\metoh_form_h2\DMol3 TSSearch\methanol opt-form+h2 opt TSSearch.xcd.

- Unable to read XCD document - Version 6.1 is an unknown format"

This happens for other file types to. I have heard that they can be converted by editing the header, but I don't know how to do this.

I am using windows 7, and I have the project settings restored to default.