After installing cumulative 4 for Service Desk Manager, the export file format has changed to xlsx, and it will not open.

Document ID : KB000007602
Last Modified Date : 14/02/2018
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After applying cumulative 4 for Service Desk Manager 14.1, the export file extension has changed from xls to xlsx. When the export is created the format is not exported in a way that matches the content type, thus Microsoft Excel will refuse to open the file.

Service Desk Manager 14.1.04

To resolve you must apply the post Cumulative 4 patch that is currently located here:

This fix will be included in a future cumulative patch, thus this problem will only be present after applying Cumulative 4.

Additional Information: