https://bz.apache.org/bugzilla/show_bug.cgi?id=62732

            Bug ID: 62732
           Summary: xlsx output by POI 4.0.0 cannot open because file
                    format or extension is not valid.
           Product: POI
           Version: unspecified
          Hardware: PC
            Status: NEW
          Severity: critical
          Priority: P2
         Component: XSSF
          Assignee: dev@poi.apache.org
          Reporter: peng...@gmx.de
  Target Milestone: ---

With previous version 3.17 there is no problem with created .xlsx output. After
upgrade to 4.0.0 the output .xlsx is corrupted and can not be opened anymore
with the message "...file format or file extension is not valid...". Used java
version is same: jdk1.8.0_172. 
My program uses a predefined xlsx as template, at run time this template will
be populated with data from database.

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