I’ve been trying to figure out how to get different file types (such as JARs) to open up as compressed folders in Windows. I’ve finally found out how:

1. Open a Windows Explorer window
2. Click on Tools -> Folder Options -> File Types
3. If you already have an associate with the file type that you want to open as a compressed folder, you’ll have to delete the association (or rename it just to be on the safe side)
4. Click New
5. Type in your file extension (JAR)
6. Click on Advanced
7. Select Compressed (zipped) Folder from the drop down (you can click in the drop down and just start typing C-O-M-P-R-E.. and it will find it for you)
8. Click OK and Close
9. Enjoy