Notes about the XCU file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
The XCU file type is primarily associated with 'OpenOffice.org' by OpenOffice.org Community. An extension provides added abilities to OpenOffice.org products. They are managed using the Extension Manager from the Tools menu in any OpenOffice.org program.