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Проверьте разрешения на ресурс и разрешения NTFS.

Например:

Symptoms of Missing NTFS Permissions Permission Symptom Write and List Folder contents The error message "Word cannot open the document" appears when you try to open a file. Read, Write These permissions allow you to open a document, but when you close the document, the temp files associated with this document are not deleted. Also you cannot save the document, because the temp files cannot be modified or deleted.

Windows NTFS permissions are required when you run Word on any NTFS partition that has Windows 2000, Windows XP Professional, Windows Server 2003, or Windows Vista installed

См. также: Description of how Word creates temporary files.