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in mine appears this: GTA V Legacy (OPEN archive).
Scan: main model = w_pi_wep1_gun, class = pistol
Base weapon: WEAPON_DOUBLEACTION (exact)
Components: —
Component check: this build has no weapon components.
Installed 'AddonWeapons' pack not found in the game (D:\GTAV\mods\update\x64\dlcpacks\AddonWeapons\dlc.rpf) — starting a fresh pack instead of extending the previously staged one.
Merged into 'AddonWeapons': weapon 'Mateba MTR-8' (3 assets); pack now holds 1 weapon(s).
WEAPON hash: WEAPON_DOUBLEACTION_AWB89338
Packed 'AddonWeapons' into a single dlc.rpf (8049152 bytes, 1 weapon(s)).
Self-checking RPF resources…
Self-check passed: all resources decompress to exactly their flagged page size — ready to install.
output: C:\Users\Drew\AppData\Local\AddonWeaponsBuilder\staging\AddonWeapons
Installing into game: D:\GTAV
update.rpf is an archive, editing dlclist.xml inside: D:\GTAV\mods\update\update.rpf

Traceback (most recent call last):
File "C:\Users\Drew\DOWNLO~1\9f598a-AddonWeaponsBuilder-1.2\AddonWeapons Builder\awb_app.py", line 207, in worker
File "C:\Users\Drew\DOWNLO~1\9f598a-AddonWeaponsBuilder-1.2\AddonWeapons Builder\awb\pipeline.py", line 233, in build_addon
File "C:\Users\Drew\DOWNLO~1\9f598a-AddonWeaponsBuilder-1.2\AddonWeapons Builder\awb\pipeline.py", line 324, in _build_merged
File "C:\Users\Drew\DOWNLO~1\9f598a-AddonWeaponsBuilder-1.2\AddonWeapons Builder\awb\pipeline.py", line 305, in _finish_merged
File "C:\Users\Drew\DOWNLO~1\9f598a-AddonWeaponsBuilder-1.2\AddonWeapons Builder\awb\installer.py", line 128, in install_to_game
File "C:\Users\Drew\DOWNLO~1\9f598a-AddonWeaponsBuilder-1.2\AddonWeapons Builder\awb\installer.py", line 110, in register_in_dlclist
File "C:\Users\Drew\DOWNLO~1\9f598a-AddonWeaponsBuilder-1.2\AddonWeapons Builder\awb\installer.py", line 74, in _add_to_dlclist_rpf
File "C:\Users\Drew\DOWNLO~1\9f598a-AddonWeaponsBuilder-1.2\AddonWeapons Builder\awb\rpf.py", line 543, in read_rpf_inner_file
File "C:\Users\Drew\DOWNLO~1\9f598a-AddonWeaponsBuilder-1.2\AddonWeapons Builder\awb\rpf.py", line 500, in _rpf_locate
File "C:\Users\Drew\DOWNLO~1\9f598a-AddonWeaponsBuilder-1.2\AddonWeapons Builder\awb\rpf.py", line 381, in _read_toc
ValueError: update.rpf: RPF encryption 0xfefffff is not OPEN — only unencrypted (GTA V Legacy / OpenIV) archives are supported.