Hi Seb.49,
Your .grv file is your account file : it contains all information related to who you are (Your certificate, your VCard, ...), with whom you are in contact (Your contacts list) and where you participate (your workspaces list)... This file does not contain
workspaces content (What you called "my documents").
When you migrate or install your account on another machine, you have to ensure that there's at least one other member in each workspace, or that your former computer is still available...
After having injected your GRV file on your new computer, workspaces should appear in your launchbar but should be disabled/greyed : Right click on their name, and click on "Get workspace" : workspace content will be downloaded from your former computer
or from another member's computer...
If you do not have access anymore to your former computer or were alone in your workspace or did not backup your workspaces as archives, unfortunately, there's no mean to get your documents back...
HTH
Fabrice