[Bug 57290] New: String Substitution not working

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57290

Bug ID: 57290
           Summary: String Substitution not working
           Product: Wine
           Version: 9.19
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: cmd
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

set "f=a.txt"
echo "%f:.=_%"

It outputs "a_txt" on Windows CMD and Wine 9.18, but output "atxt" for Wine
9.19.