/etc/mc/sfs.ini is in mc 3:4.8.11-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This is config for Single File fileSystem
#
# Notice that output files (%3) are pre-created atomically in /tmp
# with 0600 rights, so it is safe to > %3
#
gz/1 gzip < %1 > %3
ugz/1 gzip -cdf < %1 > %3
bz/1 bzip < %1 > %3
ubz/1 bzip -d < %1 > %3
bz2/1 bzip2 < %1 > %3
ubz2/1 bzip2 -d < %1 > %3
lzma/1 lzma < %1 > %3
ulzma/1 lzma -d < %1 > %3
xz/1 xz < %1 > %3
uxz/1 xz -d < %1 > %3
tar/1 tar cf %3 %1
tgz/1 tar czf %3 %1
uhtml/1 lynx -force_html -dump %1 > %3
uman/1 groff -Tascii -man %1 > %3
uue/1 uuenpipe < %1 > %3
uude/1 uudepipe < %1 > %3
crlf/1 todos < %1 > %3
cr/1 fromdos < %1 > %3
# Fixme: we need it to fail whenever it should
url:2 lynx -source `echo "%2" | sed 's-|-/-g'` > %3
nop/1 cat %1 > %3
strings/1 strings %1 > %3
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