Preventing Eclipse from opening MS Office documents in OLE editor component

I’m working with Excel and Word documents in my latest java project. On Windows plattforms Eclipse opens those documents with its own OLE editor by default. But I feel much more comfortable in using the Office apps to edit them. This can be done by right clicking on the file icon and choose “open with -> system editor” for example. But you will have to do this for each new or moved file in your workspace the first time you open it.
Thus Eclipse opens these files with Excel or Word by default you need to navigate to “Window -> Preferences -> General -> Editors -> File Associations”. You will notice, that there are no file associations for Excel nor Word. You have to explicitly add the file types (*.xls and *.doc for example) and add the desired applications as associated (external) editors.