It is highly unusual to encounter a file path like main.22.com.nvidia.valvesoftware.halflife2.obb as a keyword or as a standard file name in a game installation. At first glance, this string appears to be an (indicated by the .obb extension) that has been either renamed, incorrectly generated, or corrupted.
main.<version_code>.<package_name>.obb
Valve Software and NVIDIA do not ship a file with that exact name. The correct, standard naming convention for an Android expansion file is: main.22.com.nvidia.valvesoftware.halflife2.obb
The core issue lies in the . In standard Android development, package names follow reverse-domain notation (e.g., com.company.game ). Your string uses com.nvidia.valvesoftware.halflife2 . Notice the missing dot between valvesoftware and halflife2 . It is highly unusual to encounter a file path like main