The purpose of this associated temporary file is to lockout editing of your MS document to other users while you have it open.
The associated temporary file remains present in the same location as your MS document until you close your document. However, you will not be able to see the associated temporary file from within the Finder because it is a hidden file. Whenever you save a Microsoft Office document (Word, Excel or PowerPoint) to your local hard drive or to a fileserver, an associated temporary file is created to the same location as your MS Office document.
