https://sims4studio.com/thread/1777/extract-sims-object-packages-conversion?page=1

How to extract Sims 3 object .packages for conversion to The Sims 4Introduction:

This supplementary tutorial is for use with the “How to easily import a Sims 3 mesh to Blender from .package” tutorial by orangemittens. This one is for creators who are not familiar with how to extract a .package from the TS3 game files or from a Sims3Pack, as needed for OM's tutorial.

It will show you how to either:

1. Extract an object from The Sims 3 game and its expansion/stuff packs and save it as a .package. (Can also be used for CAS items - see August 22 2015 update within the 'Extracting an object from the TS3 game and saving it as a .package' section below)

or

2. Convert a Sims3Pack to a .package. In the case of 3rd party cc Sims3Packs (non-EA/Maxis items), please be sure you get permission from its creator to convert his/her creation.

The .package file exported by either of the above two methods can then be used with OM’s tutorial for importing the object’s meshes into Blender, and with Sims 3 Package Editor for exporting the object’s textures.

What you need:

For extracting objects from the TS3 game: The Sims 3 game and any of its expansion/stuff packs installed on your computer.Sims 3 Object Cloner (s3oc)Sims 3 Package Editor (s3pe) For converting Sims3Packs to .packages:Delphy's Sims3Pack Extractor

Getting Started

If what you're wanting to do is to extract an object from the TS3 game files, then read the first section, "Extracting an object from the TS3 game and saving it as a .package". If you're looking to convert a Sims3Pack to .package, then skip ahead to the next section, "Converting a Sims3Pack to .package".

Extracting an object from the TS3 game and saving it as a .package

Download and install s3oc and s3pe following the instructions given on their download pages, including installing the .Net 4.0 framework files from the link provided if you don't already have .Net 4.0 on your PC. (If you try to run s3oc or s3pe and get an error instead, then you need the .Net 4.0 download.)

On running s3oc for the first time, you'll see the below main screen. Go into its Settings menu/Creator Name and enter your creator name, then into Settings menu/Game Folders and make sure s3oc has automatically filled in your game paths for your base game and any packs. If not, browse to anything that’s missing and save it to the folder list.

To clone an object, click the ‘Cloning’ menu and choose ‘Normal Objects’. Now s3oc will read in all the game objects. This may take a few minutes depending on how many packs you have installed.

Once the list is produced, your screen will look similar to the below pic. You can sort the list by clicking on the 'Name' and/or 'EP/SP' headings. In this example, we’re cloning a desk from the ITF pack. Select the item, then click the ‘Clone or Fix’ button at the bottom right.

The window will then change to one that shows that the item is ready to process. Click the Start button at the lower left.