The Open command can be invoked 4 ways:
By clicking Open a previously saved document and the Choose button when Opening a New Document
Any of these methods results in the same action by KWord.
When trying to open a file, a dialog appears.

Lets look at this dialog more closely:
This dialog shows my current directory is /home/mmcbride/kword. You can see this by the textbox at the top of the dialog
The large box below that shows I currently have 1 folder in this directory, entitled Past Work, and 2 files (Job Description and Resume).
In the upper left corner, is a blue arrow pointed up. This arrow will take you up one level in the directory structure.
The next two buttons are backwards and forward buttons. These buttons work just like a browser, where you can use the back button to travel to the previous directory, and the forward button to advance into a directory you just came from.
Next to the arrow buttons, is a button that looks like a house. Clicking this will take you to your home directory.
Next to the home button, is a reload button. Clicking this button, causes KWord to reload the current directory in the event things have changed.
Next to the reload button, is a button with a grey ribbon on it. This button allows you to set and navigate through bookmarks. This is a quick way to jump to commonly accessed directories. By clicking this button, a submenu appears which allows you to add bookmarks or jump to a new bookmark.
Next to the bookmark button, is a new folder button. If you want to create a new folder, simply click the button. KWord will ask for a name for the folder. Then the folder will be created and you will automatically be placed in the new folder.
The text box labled Location is blank. Once you click on a filename, that filename will appear in this blank. Alternativly, you can simply type the filename in the blank.
The text box labled Filter shows we intend to load all file types. Using KWord, you can load files from other formats. For information on this, see the section on Filters.
Another function of the Filter box, is to act as a file mask. A file mask hides all the files that KWord believes are unimportant to your current task. When the KWord filetype is set to KWord file, the dialog box only shows Folders, and files ending in .kwd. If you file does not end in .kwd, you need to change the file type box to read All files, by selecting the drop down box. Now all files will be displayed.
Using this dialog, you can move through the directory tree to find a location to load your document from.
To enter a folder, you double click on that folder. To exit that folder click the blue up arrow button.
There is a Cancel button, if you click this button, the load will be aborted.
There is a OK button, which will be used when we have selected the correct location, correct format and correct filename.