Keywords: Redmine - Windows - Technical issue - Other
To recreate it - just create an Issue, create a text file with any name containing "+" (plus sign) e.g. "Test+File.txt" and attach that file to the issue and submit. After that open that issue, and try to download that file. It will show "404 - File or directory not found." error. Then edit the attachments - rename the file to "Test_File.txt", and then try downloading it - it will get downloaded without any issues.