JSI Tip 6401. When you save a file to a UNC path from Windows XP, you receive a Locked or Access Denied error?

If you opened a file using a UNC path and subsequently try to save it to that UNC path, you may receive an error similar to one of the following:

Cannot read file. File is locked

Access Denied

Lock Error

Your event log may contain:

Event Source: Application Popup
Event Category: None
Event ID: 26
User: N/A
Description: Application popup: Windows - Delayed Write Failed : Windows was unable to save all the data for the file. The data has been lost. This error may be caused by a failure of your computer hardware or network connection. Please try to save this file elsewhere. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

This is likely to be a bug.

Until it is fixed in a Service Pack, you can try a workaround by setting the EnableOplocks data value to 0.

NOTE: You must restart your workstation for this setting to become effective.