Hi,
Where did the user stored the files? Network drive or local disk? A temporary file is a file that is created to temporarily store information in order to free memory for other purposes, or to act as a safety net to prevent data loss when a program
performs certain functions. For example, Word determines automatically where and when it needs to create temporary files. The temporary files only exist during the current session of Word. When Word is shut down in a normal fashion, all temporary
files are first closed and then deleted. More detailed explanation:
https://support.microsoft.com/en-us/kb/211632
Thus, if the user has no full control of the folder/disk/network drive, Office can't delete temp file after closed. Please try to check the user's permission first.
Next, this issue also might be caused by the antivirus software. For example: It is caused by
McAfee's "On-Access" scanner, specifically with the "On network drives" option enabled.
Please try to check the option's of antivirus software.
More discussion
http://answers.microsoft.com/en-us/office/forum/office_2007-excel/office-2007-creates-xxxxxxxxtmp-files-in-same/eb7ee34d-3a02-4fe7-a1f3-9a208439d84a?page=1
Regards,
George Zhao
TechNet Community Support