Is it possible to ask the user for a folder in Acrobat by javascript?. To make the user choose a folder in a dialog window? If possible I would like the dialog box to start from j:\
No. In Acrobat JavaScript, there's no property you can use to set the default directory for a file browser dialog. However, Acrobat tends to remember the path to the last file selected by the dialog so once a user navigates to that folder once, they're likely to end up there the next time.