Open (convert) a COPY of the FP6 file in FMP 11, the extension will change to FP7.
Duplicate (or save a copy) of the new file, test your layout copy.
Thanks for the response. I already converted the file - and that worked great, but the layout did not copy with the file conversion. So I need to know how to convert just a layout (because copy and paste doesn't work). Thanks!
Due to different file formats you can't copy and paste from 6 to 11 as you've discovered.
The converted copy of the file should have all the layouts from the version 6 original file. If you don't, then you had some problem with the conversion process itself. Perhaps the layout in the version 6 copy had some corruption that was ignored by FileMaker 6, but not by 11 during the conversion process.
You might try recovering your version 6 copy, converting the recovered copy and then copying and pasting from the converted copy if the layout is accessible in this converted copy.