On Mon 2023-01-23 09:12 PM MST -0700, <mailma...@coopercontent.com> wrote:

$ file ~/Library/Preferences/com.freron.MailMate.plist
/Users/XXXX/Library/Preferences/com.freron.MailMate.plist: Apple binary property list

Do not know when "old-style ASCII" plists were superseded by "Apple binary."

I don't think it's a matter of when. I'm running MailMate 5925 on Mac OS 13.1. I think the "binary" designation is just a way to keep text programs from understanding the file as a text-based file. (BBEdit is one of the few programs that will attempt to open any file you ask it to.)

The plot thickens. It really is a binary file:

[daffy] $ head ~/Library/Preferences/com.freron.MailMate.plist | cat -v
bplist00?^PM-^W^@^A^@^B^@^C^@^D^@^E^@^F^@^G^@^H^@       ^@
...

But bbedit does in fact open it just fine. I think it must be doing some magic behind the scenes, maybe based on plutil or equivalent. The user manual says:

    BBEdit transparently opens and displays the contents of any bz2 or
gzip-compressed files (“.bz2”, “.gz” and “.gzip” files), as well as tarballs (“.tar” files) and binary plists (“.plist” files), both
    directly and during multi-file search.

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