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Call of Duty 4: Play Multiplayer in Story Mode? Impossible—They're Separate Modes

You cannot play multiplayer inside the story mode (campaign) of Call of Duty 4: Modern Warfare. They are completely separate executables/menu entries with different code paths, assets, and networking.

The Two Modes

Aspect	Campaign (Story Mode)	Multiplayer
Executable	`iw3sp.exe` (PC) / `default.xex` (360/PS3)	`iw3mp.exe` / `default_mp.xex`
Players	1 (single-player)	2–18 (online), 2 (split-screen 360/PS3)
Progression	Linear missions, scripted events	XP, ranks, prestige, unlocks, challenges
Maps	Unique SP maps (some reused in MP)	Dedicated MP maps (Crash, Crossfire, Shipment...)
AI	Scripted squads, infinite respawn	Human players only (bots only in private match PC)
Save System	Checkpoints / Save & Quit	Persistent profile (server-stored)

How to Access Multiplayer

Main Menu → Multiplayer (not "Campaign")
Sign in to Xbox Live / PSN / Steam / IW4x / Plutonium
Choose: Find Match (matchmaking), Server Browser (PC), Private Match (custom), Split-Screen (console, 2 players)

Common Confusion Sources

"Spec Ops" (MW2/MW3): Co-op missions separate from Campaign and MP. CoD4 has no Spec Ops.
"Co-op Campaign": Not in CoD4. Added in World at War (2-player), MW2 (Spec Ops), BO3 (4-player campaign).
Mods: PC mods like CoD4: Online (custom SP co-op) exist but are unofficial, unsupported, and separate downloads.

Select "Multiplayer" from the main menu. That's the only way.

Role Playing Games