Opening a Document
From Apache OpenOffice Wiki
From the Start Menu
You can open a document from the Start Menu by selecting thebutton, which will bring up the open dialog box, from which you can select your document. Alternatively, you can select and hold the button to choose from a list of recently used documents.
From an Open Document
From an open document, you can open another document in one of three ways:
The Open dialog box will appear. Select the file you wish to open and click. The file will open in a new window. When choosing files, you can filter by filetype such as .odt, .doc, or .txt.