I reproduced a bug report by a user. When using IE11 on Windows 10, clicking on any attachment in any post will result in downloading a file called attachment.php If you are configured to open instead of save, then Windows will prompt you for what application to use to open a PHP file, if you do not have a default set.
After the download I renamed the file back to .xlsx and it was the intended Excel file.
I am guessing this is a bug in the forum code though I don't know this would only happen in IE. I use Chrome and see no such problem.
Bookmarks