programmatically change "save as" location for generated word file

hi,

copied from: http://social.msdn.microsoft.com/Forums/office/en-US/f6915a62-6cbf-4333-b9c3-7de49f43b563/programmatically-change-save-as-location-for-generated-word-file

i generate a word file with the openxml sdk and open it (from a memory stream). if the user modifies and closes (and saves) the document, the default save location is "My Documents".

I want to change the default path to a document library in sharepoint. I haven't found any information about that.

Any hints?