4.5. What the heck is a +IN suffix on a file?
On the UNIX PC, "+IN" denotes an "Installable File". If you
were to use the UA it would show that it's an Installable File. The
Installable format is just a normal cpio archive. The file can be
installed by hand by doing:
# mkdir /tmp/install
# mv FILE+IN /tmp
# cd /tmp/install
# cpio -icduvmB < ../FILE+IN
A list of other Suffixes appears in the file
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