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


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


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?

1 Answer 1


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.

  • Does the same apply to /Library files?
    – abovdal
    Commented Oct 21, 2019 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
    Commented Oct 22, 2019 at 5:14

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