Saving Corel Draw 11 files to Corel Draw X7

I have upgraded from Corel Draw 11 to Corel Draw X7.  I am unable to access the Corel Draw 11 files in the X7.  They all have the CDR extension.  Any suggestions on how I can save my Corel Draw 11 files so I can access them in Corel Draw X7 without recreating everything.  I have a lot of signs that I use over and over again.

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