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how to automatically save new file into document library with a unique name or ID?

Posted By:      Posted Date: August 27, 2010    Points: 0   Category :SharePoint
I've created a form using MS Word Document (2007) and lock it (protect it) so that users will be able to fill in the required fields.
then i've created a Content Type and uploaded the MS word form to be used as a template.

Then I've created a document library and enabled the content type and associate the above form for the library, so that when users click on New button the form will open.

everythings goes fine till here.

The problem is when users clicks on New and save the file back to the library, It doesn't save it with a unique name, instead it is over writting the existing one.
in other words, if employee 1 fill up the form and save it and later on employee 2 accessed the library and fill up a new form, he will overwrite what employee 1 has already saved!!

Is there a way to give every new created file a unique name? maybe (username+time)??

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