Hi Vimal,
I am not sure but can you try opening it in a text editor format (notepad/wordpad) and then try doing the changes in the default settings.
Best Regards
Kapil Sharma
In NX, open the customer defaults (File -> Utilities -> Customer Defaults), change the defaults level to site. Note: if the site level says (Read Only), you will have to change permissions on the files/folders you want to write to. Once you have the proper permissions set, make your changes (be sure to have the proper units selected, you can have different settings for metric/english files) and OK the dialogs to save your new settings.
Keep in mind that the specific default for modeling tolerance is a "Part" setting and that even if the default is changed if the template parts for "File-> New" are not also changed the effect of the changed customer default will be obscured by the template part settings.
Thanks for your suggestions, i am able to open the user.dpv which i received from one customer. But i am not sure how to define this new settings in it.