Dear Maintainer,
sections that start like this do not work anymore:
[sound]
Regex=\.(wav|snd|voc|au|smp|aiff|snd|m4a|ape|aac|wv|spx|flac)$
RegexIgnoreCase=true
View=%view{ascii} /usr/lib/mc/ext.d/sound.sh view common
…
The section works again (on one extension only, of course) if the Regex line is replaced by Shell=.m4a