diff --git a/data/dynos_coop.c.h b/data/dynos_coop.c.h
index 98d4e11a5..ddeb6ba4a 100644
--- a/data/dynos_coop.c.h
+++ b/data/dynos_coop.c.h
@@ -13,6 +13,7 @@ const char* dynos_packs_get(s32 index);
 bool dynos_packs_get_enabled(s32 index);
 void dynos_packs_set_enabled(s32 index, bool value);
 
+void dynos_add_actor_custom(const char *modPath, const char* geoName);
 const void* dynos_geolayout_get(const char *name);
 
 #endif
diff --git a/data/dynos_coop_c.cpp b/data/dynos_coop_c.cpp
index 5f431df8e..c3a0e6fee 100644
--- a/data/dynos_coop_c.cpp
+++ b/data/dynos_coop_c.cpp
@@ -53,6 +53,10 @@ void dynos_packs_set_enabled(s32 index, bool value) {
     DynOS_Gfx_GetPacksEnabled()[index] = value;
 }
 
+void dynos_add_actor_custom(const char *modPath, const char* geoName) {
+    DynOS_Geo_AddActorCustom(modPath, geoName);
+}
+
 const void* dynos_geolayout_get(const char *name) {
     return DynOS_Geo_GetActorLayoutFromName(name);
 }
diff --git a/data/dynos_gfx_load.cpp b/data/dynos_gfx_load.cpp
index ba0c61d54..97d90bd10 100644
--- a/data/dynos_gfx_load.cpp
+++ b/data/dynos_gfx_load.cpp
@@ -272,7 +272,11 @@ GfxData *DynOS_Gfx_LoadFromBinary(const SysPath &aPackFolder, const char *aActor
     // Look for actor in pack
     if (_Pack) {
         for (s32 i = 0; i != _Pack->mGfxData.Count(); ++i) {
+#ifdef COOP
+            if (!strcmp(_Pack->mGfxData[i].first, aActorName)) {
+#else
             if (_Pack->mGfxData[i].first == aActorName) { // Perfectly valid, aActorName comes from static RO data, so its address never changes during execution
+#endif
                 return _Pack->mGfxData[i].second;
             }
         }
diff --git a/data/dynos_gfx_read.cpp b/data/dynos_gfx_read.cpp
index d8060bbd2..a85e26429 100644
--- a/data/dynos_gfx_read.cpp
+++ b/data/dynos_gfx_read.cpp
@@ -1826,9 +1826,6 @@ void DynOS_Gfx_GeneratePack(const SysPath &aPackFolder) {
             // If there is an existing binary file for this layout, skip and go to the next actor
             SysPath _BinFilename = fstring("%s/%s.bin", aPackFolder.c_str(), _GeoRootName.begin());
             if (fs_sys_file_exists(_BinFilename.c_str())) {
-#ifdef COOP
-                DynOS_Geo_AddActorCustom(aPackFolder, _GeoRootName.begin());
-#endif
                 continue;
             }
 
@@ -1884,10 +1881,6 @@ void DynOS_Gfx_GeneratePack(const SysPath &aPackFolder) {
             } else {
                 Print("  %u error(s): Unable to parse data", _GfxData->mErrorCount);
             }
-#ifdef COOP
-            // Add to custom actors
-            DynOS_Geo_AddActorCustom(aPackFolder, _GeoRootName.begin());
-#endif
             // Clear data pointers
             ClearGfxDataNodes(_GfxData->mLights);
             ClearGfxDataNodes(_GfxData->mTextures);
diff --git a/src/pc/mods/mod.c b/src/pc/mods/mod.c
index 688dbc2ce..295bbf120 100644
--- a/src/pc/mods/mod.c
+++ b/src/pc/mods/mod.c
@@ -1,9 +1,47 @@
 #include "mod.h"
 #include "mods.h"
 #include "mods_utils.h"
+#include "data/dynos_coop.c.h"
 #include "pc/utils/misc.h"
 #include "pc/debuglog.h"
 
+void mod_activate(struct Mod* mod) {
+    // activate dynos models
+    for (int i = 0; i < mod->fileCount; i++) {
+        struct ModFile* file = &mod->files[i];
+        if (!str_ends_with(file->relativePath, ".bin")) {
+            continue;
+        }
+
+        char dynosPath[SYS_MAX_PATH] = { 0 };
+        if (snprintf(dynosPath, SYS_MAX_PATH - 1, "%s/actors", mod->basePath) < 0) {
+            LOG_ERROR("Failed to concat dynos path");
+            continue;
+        }
+
+        // copy geo name
+        char geoName[64] = { 0 };
+        if (snprintf(geoName, 63, "%s", path_basename(file->relativePath)) < 0) {
+            LOG_ERROR("Truncated geo name");
+            continue;
+        }
+
+        // remove '.bin'
+        char* g = geoName;
+        while (*g != '\0') {
+            if (*g == '.') {
+                *g = '\0';
+                break;
+            }
+            g++;
+        }
+
+        // Add to custom actors
+        dynos_add_actor_custom(dynosPath, geoName);
+        LOG_INFO("Activating DynOS: '%s', '%s'", dynosPath, geoName);
+    }
+}
+
 void mod_clear(struct Mod* mod) {
     for (int j = 0; j < mod->fileCount; j++) {
         struct ModFile* file = &mod->files[j];
diff --git a/src/pc/mods/mod.h b/src/pc/mods/mod.h
index 142c67fa4..3123b5350 100644
--- a/src/pc/mods/mod.h
+++ b/src/pc/mods/mod.h
@@ -30,6 +30,7 @@ struct Mod {
     size_t size;
 };
 
+void mod_activate(struct Mod* mod);
 void mod_clear(struct Mod* mod);
 bool mod_load(struct Mods* mods, char* basePath, char* modName);
 
diff --git a/src/pc/mods/mods.c b/src/pc/mods/mods.c
index 47e5df31e..03bb2b4f3 100644
--- a/src/pc/mods/mods.c
+++ b/src/pc/mods/mods.c
@@ -62,6 +62,7 @@ void mods_activate(struct Mods* mods) {
         struct Mod* mod = mods->entries[i];
         if (mod->enabled) {
             gActiveMods.entries[gActiveMods.entryCount++] = mod;
+            mod_activate(mod);
         }
     }
 
diff --git a/src/pc/network/network.h b/src/pc/network/network.h
index af9fba0ff..0ee3ee743 100644
--- a/src/pc/network/network.h
+++ b/src/pc/network/network.h
@@ -80,7 +80,7 @@ struct SyncObject {
     void* extraFields[MAX_SYNC_OBJECT_FIELDS];
     bool rememberLastReliablePacket;
     bool lastReliablePacketIsStale;
-    u8 extendedModelId;
+    u16 extendedModelId;
 };
 
 enum PlayerInteractions {
diff --git a/src/pc/network/packets/packet_object.c b/src/pc/network/packets/packet_object.c
index f1a02d0e0..d2261008a 100644
--- a/src/pc/network/packets/packet_object.c
+++ b/src/pc/network/packets/packet_object.c
@@ -150,7 +150,7 @@ struct SyncObject* network_init_object(struct Object *o, float maxSyncDistance)
     so->on_forget = NULL;
     so->syncDeathEvent = true;
     if (!hadSyncId) {
-        so->extendedModelId = 0xFF;
+        so->extendedModelId = 0xFFFF;
     }
     so->randomSeed = (u16)(o->oSyncID * 7951);
     memset(so->extraFields, 0, sizeof(void*) * MAX_SYNC_OBJECT_FIELDS);
diff --git a/src/pc/network/packets/packet_spawn_objects.c b/src/pc/network/packets/packet_spawn_objects.c
index c9d536956..b10ac77bb 100644
--- a/src/pc/network/packets/packet_spawn_objects.c
+++ b/src/pc/network/packets/packet_spawn_objects.c
@@ -21,7 +21,7 @@ struct SpawnObjectData {
     s16 activeFlags;
     s32 rawData[80];
     u8 globalPlayerIndex;
-    u8 extendedModelId;
+    u16 extendedModelId;
 };
 #pragma pack()
 
@@ -74,9 +74,9 @@ void network_send_spawn_objects_to(u8 sendToLocalIndex, struct Object* objects[]
         u32 model = models[i];
         u8 parentId = generate_parent_id(objects, i, true);
         u32 behaviorId = get_id_from_behavior(o->behavior);
-        u8 extendedModelId = (o->oSyncID != 0 && gSyncObjects[o->oSyncID].o == o)
-                           ? gSyncObjects[o->oSyncID].extendedModelId
-                           : 0xFF;
+        u16 extendedModelId = (o->oSyncID != 0 && gSyncObjects[o->oSyncID].o == o)
+                            ? gSyncObjects[o->oSyncID].extendedModelId
+                            : 0xFFFF;
         packet_write(&p, &parentId, sizeof(u8));
         packet_write(&p, &model, sizeof(u32));
         packet_write(&p, &behaviorId, sizeof(u32));
@@ -86,7 +86,7 @@ void network_send_spawn_objects_to(u8 sendToLocalIndex, struct Object* objects[]
         packet_write(&p, &o->header.gfx.scale[1], sizeof(f32));
         packet_write(&p, &o->header.gfx.scale[2], sizeof(f32));
         packet_write(&p, &o->globalPlayerIndex, sizeof(u8));
-        packet_write(&p, &extendedModelId, sizeof(u8));
+        packet_write(&p, &extendedModelId, sizeof(u16));
     }
 
     if (sendToLocalIndex == PACKET_DESTINATION_BROADCAST) {
@@ -122,7 +122,7 @@ void network_receive_spawn_objects(struct Packet* p) {
         packet_read(p, &scale[1], sizeof(f32));
         packet_read(p, &scale[2], sizeof(f32));
         packet_read(p, &data.globalPlayerIndex, sizeof(u8));
-        packet_read(p, &data.extendedModelId, sizeof(u8));
+        packet_read(p, &data.extendedModelId, sizeof(u16));
 
         struct Object* parentObj = NULL;
         if (data.parentId == (u8)-1) {
@@ -155,7 +155,7 @@ void network_receive_spawn_objects(struct Packet* p) {
         }
 
         // load extended model
-        if (data.extendedModelId != 0xFF) {
+        if (data.extendedModelId != 0xFFFF) {
             u8 loadedModelId = smlua_model_util_load(data.extendedModelId);
             if (loadedModelId != 0xFF) {
                 data.model = loadedModelId;