Once the file has been modified in CNX2 there does not appear to be any way of making it re-editable in viewNX, I don't have any experience with capture1 but the files are still editable in Adobe Camera Raw.
|Something Blue by Gerard Beullac|
from Your City - One Way Only
|Glen Canyon Dam on the Colorado River by wam7|
|Volvo by Jill Hancock|
from V is for...