A Sims3Pack is actually some sort of container/archive for package files (similar to files inside a zipped archive). To get to the files that are within a Sims3Pack, you have two options:
- Install the file through the launcher as usual and find the extracted files in the DCBackup folder afterwards (sort by date for easier find, they have cryptic names)
- Use Delphy’s Multi Sims3Pack Extractor.
Multi Sims3Pack Extractor
Installation instructions can be found in the Overview page of the tool
Copy all sims3pack files that you want to convert in a folder of your choice (in the picture X:\Sims). All files that the tool finds in this folder are being converted automatically. To set this folder in the tool choose browse in Step 1.
In Step 2 you can choose where you want to extract your files to. I recommend to choose another folder than the mods folder to extract the files to (in the picture X:\Sims, too)
Now you have to decide how you want to name the package files. You can name them the way they are inside the sims3pack file. These are cryptic names. To do so, check the option rename file on save. If you do not check the option, the package files are named the same as the sims3pack. This is only true if there is only one package file inside the sims3packs. Houses and Sims have more then one most of the time.
Now click on Extract and you’re done.
To get those files into the game, move them into the Mods-Folder.
To convert package files to Sim3Packs you will need TSR Workshop or this tool: Sims3Pack File Generate Tool but I have never used those myself.