We should not use system specific file separator for email templates as they are read off the classpath.

Places where a system specific separator is used stop working when deploying a closed war on windows. Open war works.

We need to simply hardcode forward slash as Java takes care of this on all operating systems.

The bug is in com.atlassian.jira.web.action.admin.JiraSupportRequest file

For more information on this type of problem see JRA-11739.