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I am running Mojave 10.14.6 (on a late 2013 MacBook Pro), waiting to upgrade to Catalina. Checking for 32bit applications lead to a list containing

/System/Library/Frameworks/DiscRecording.framework/Versions/A/Resources/draudiotool
/System/Library/Frameworks/AppKitScripting.framework/Versions/A/AppKitScripting
/System/Library/PrivateFrameworks/vmutils.framework/Versions/A/vmutils
/System/Library/PrivateFrameworks/CoreMediaPrivate.framework/Versions/A/CoreMediaPrivate

(which seem to be mostly Unix executable files), some dynamic libraries, a few apps, and then some items like this

/sbin/autodiskmount
/usr/sbin/pictd
/usr/lib/libnetsnmp.5.2.1.dylib
/usr/bin/qc2movie

Are these 32-bit code files that are going to block the use of apps, even if the apps are 64-bit? Will installing Catalina remove them, or should I delete them first? I can delete the apps (don’t need or can upgrade them), but is there anything I can do ahead of time with this list?

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The content of /System as well as all files in /sbin, /usr/sbin, /usr/lib and /usr/bin is part of a macOS installation and will be replaced/upgraded if/when you upgrade to Catalina.

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  • Does the same apply to /Library files?
    – abovdal
    Oct 21 '19 at 20:51
  • @abovdal It depends :-) Files there are installed by macOS as well as by applications, but usually this should be obvious based on the folder/file names.
    – nohillside
    Oct 22 '19 at 5:14

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