Hello Greysmoke,
We have two known issues with the Office file dialog:
1) The file dialog that only shows you your workspaces and Documents workspace, by default. To workaround this, our Add-in provides the complete list.
2) You can only open shared workspaces (and documents within those workspaces) directly from Office. Currently, there isn’t a way to open an individually shared document directly from Office i.e. those that show up under Shared With Me/Documents Workspace. To open an individual shared document, you need to login into Office Live via the web.
To open a shared workspace starting from Office, follow these steps:1) Open Excel, log into Office Live - a File dialog opens up with Open/Cancel buttons showing "My Workspaces".
2) Close this file dialog.
3) Go back to the file menu and click on "Open from Office Live".
4) Select the shared workspace from the flyout and the file dialog will open with the documents in that workspace.
Kavitha