Since iOS 9.3.5 is a legacy version, the most reliable way to get the full-featured Filza is through on a jailbroken device.
: Native ability to compress and extract .zip , .tar , and .gz files. How to Download & Install filza file manager ios 9.3.5 download
Built-in text editor, plist (property list) viewer, and hex viewer. Media player and image viewer for raw extracted files. ZIP/RAR file extraction and compression. 📥 Prerequisite: Jailbreaking iOS 9.3.5 Since iOS 9
Once Filza is installed, here is how to navigate it safely: plist (property list) viewer