As far as I know - NO!
You could try to make an ASCII-export of the program, and then import this copy with your 6.10-version of GXIEC. If that doesn´t work, then I would suggest you buy a newer version of GXIEC.
I have done this with a GX Developer pgm and it might work with iec. Create a project with the older version then transfer the file named "BROWSER"(this contains all the pgm code/logic). from the newer version into your older version and then try and open it hope it works Best of luck.