You cannot open this file with standard Windows tools. To view or modify its contents, you must use specialized software:

x64f.rpf/ ├── levels/ │ └── gta5/ │ ├── props/ # Main directory for static and interactive props (see breakdown below) │ ├── destruction/ # Pre-baked destruction physics for scripted events │ └── ... (other level-specific data)

Ensure you have the ASI Loader and OpenIV.asi installed through the OpenIV ASI Manager tool to enable editing.

Right-click x64f.rpf > Properties > Uncheck "Read-only" > Apply to all subfolders (if prompted). Also ensure you run OpenIV as Administrator.