Yu Zhan

> Just for completeness, thoughts on the issue here: > > [06580bf#commitcomment-54476582](https://github.com/acmesh-official/acme.sh/commit/06580bf0e457fafb63fdd2e7aa8fad36dfb86d35#commitcomment-54476582) Remove the `+` works for me.

@straydogstudio I'm also getting a similar issue. MS Excel 2016 cannot open the generated document, but Numbers can. The document was generated through a rails controller. Here's my gem versions....