Adding images leads to unreadable file (revisit)
*Created originally on Bitbucket by [jabbors (Johan Abbors)](https://bitbucket.org/%7B9a79ce48-9f52-4286-8b94-893f8448b884%7D/)*
This is follow-up on issue #500.
With openpyxl version 2.3.0 I get unreadable files when I add an image to a workbook. It opens fine with LibreOffice but not with Excel for Mac v15.15.
If I choose the repair the file, the image is there.
*Attachments:* [Screen_Shot_2015-10-30_at_14.10.18](/uploads/7d02a4fd55c039b441794a2cfa4ac59f/Screen_Shot_2015-10-30_at_14.10.18.png)
issue