[Q]Modding Stock File Manager topic

Hey There Everyone! I have Jellybean 4.2.2 AOSP ROM in my phone... There are many apps that don't have a nice Look... The one biggest thing that lacks is, the apk files icons don't show up... but only apk file icon... Please tell me how can I mod this, I've seen many stock FileManagers with this feauture... I don't wanna use Third Party File Managers... Please guide me...