/etc/Muttrc.d/compressed-folders.rc is in mutt 1.5.23-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | # Use folders which match on \\.gz$ or \\.bz2$ as [gb]zipped folders:
open-hook \\.gz$ "gzip -cd '%f' > '%t'"
close-hook \\.gz$ "gzip -c '%t' > '%f'"
append-hook \\.gz$ "gzip -c '%t' >> '%f'"
open-hook \\.bz2$ "bzip2 -cd '%f' > '%t'"
close-hook \\.bz2$ "bzip2 -c '%t' > '%f'"
append-hook \\.bz2$ "bzip2 -c '%t' >> '%f'"
open-hook \\.xz$ "xz -cd %f > %t"
close-hook \\.xz$ "xz -c %t > %f"
append-hook \\.xz$ "xz -c %t >> %f"
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