/usr/share/doc/wl-beta/examples/en/dot.folders is in wl-beta 2.15.9+0.20171209-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# ~/.folders sample file.
#
# For further information, see section "Folders" in the Info.
#
# Lines begin with '#' are comment.
# Empty lines are ignored.
#
## incoming mail box for IMAP users
# %inbox
## incoming mail box for POP users
# &USERNAME@POP3.EXAMPLE.COM
## [ pipe folder might be useful for some users ]
## [ which get mails and take them in. ]
# |&USERNAME@POP3.EXAMPLE.COM|+inbox
## trash, draft and queue
+trash
+draft
+queue
## `$' marked important messages
'flag/important
## MH folder
+inbox
## IMAP folder
# %inbox.emacs.wl
# %inbox.emacs.apel-ja
## MH folder via IMAP
# %#mh/inbox
## NNTP folder
# -fj.os.bsd.freebsd
# -fj.mail.reader.mew
# -fj.news.reader.gnus
## [ other NNTP server ]
# -jlug.ml.users@NEWS.EXAMPLE.NET
# -emacs.auc-tex@NEWS.EXAMPLE.ORG
# -ring.openlab.skk@NEWS.EXAMPLE.COM
## group definition
## [ folders between curly bracket are treated as in a group. ]
# Emacsen{
# +to/wl
# +to/mew-dist
# +to/apel-ja
## [ You can define multi level group. ]
# XEmacs{
# +to/xemacs-beta
# +to/xemacs-beta-ja
# +to/xemacs-mule
# }
# }
## access group
## [ If there is '/' in the end of line, all subfolders are added to group. ]
## [ Use `C-u RET' for update access group. ]
+ /
## access group for IMAP user
# % /
|