Toolbars and the Keyboard Shortcuts customization is not migrated between versions.
Migration of toolbar buttons that point to external programs is not supported.
Migration of non-US currency selection from version 8.0 or 9.0 is not supported.
The default file extension does migrate with Corel 10. Corel 10’s options pane does not support alternative extensions other than the four settings in its drop-down list (XLS, QPW, WB3, WK4). If you subsequently save the options screen, then the setting will be changed to one of these.