The chances are small, but you can try :
- Create a new file
- File > Import and select the CDR file.
Sometimes, that will work.
Method 2 -- rename the file, so that it ends in .zip instead of .cdr. Now double click on the file. You should see several folders including one labelled content. Open that and look for a file named riffdata.cdr. Without closing those folders,
Copy that to the desktop.
Now, try opening the riffdata.cdr.
If these steps do not resolve the problem,take a look how to fix .cdr error codes
HERE.