Hi govindbaker, thanks for this hint: Adding this line to the manifest file works well with our coldfusion 9 server.
Unfortunately it does not work with coldfusion 10 enterprise.
After creating the new zip, cf 10 is not able to find the cfgrid classes. I have already checked that the directory structure of the new jar is identical to that of the old jar. Tried several different ways to create the zip, or only to replace the manifest file in the existing zip: nothing worked: As soon as the manifest file in CF 10 has been changed, the classes will not be found.
My workaround now is, to replace the cfgrid with a modern html5 editable table.
