diff --git a/generateOmniArchive.py b/generateOmniArchive.py
new file mode 100644
index 0000000..f524a61
--- /dev/null
+++ b/generateOmniArchive.py
@@ -0,0 +1,76 @@
+# important that this runs *AFTER* any mojang server-related scripts. it depends on normal launcher files already being there
+import json
+import os
+from urllib.request import urlopen
+
+from meta.common import ensure_component_dir, polymc_path
+from meta.common.mojang import MINECRAFT_COMPONENT
+
+PMC_DIR = polymc_path()
+ensure_component_dir(MINECRAFT_COMPONENT)
+
+net_minecraft_files = os.listdir(os.path.join(PMC_DIR, MINECRAFT_COMPONENT))
+
+def gen_compatible_meta_obj(version_meta):
+    out = {
+        "assetIndex": version_meta["assetIndex"],
+        "compatibleJavaMajors": [8],
+        "formatVersion": 1,
+        "mainClass": version_meta["mainClass"],
+        "mainJar": {
+            "downloads": {
+                "artifact": version_meta["downloads"]["client"]
+            },
+            "name": f"com.mojang.minecraft:{meta_id}:client"
+        },
+        "name": "Minecraft",
+        "omni": True,
+        "order": -2,
+        "releaseTime": version_meta["releaseTime"],
+        "requires": [
+            {
+                "suggests": "2.9.4-nightly-20150209",
+                "uid": "org.lwjgl"
+            }
+        ],
+        "type": version_meta["type"],
+        "uid": "net.minecraft",
+        "version": meta_id
+    }
+
+    # make needed changes depending on version type
+    if version_meta["type"] == "old_alpha":
+        out["+jvmArgs"] = ["-Dhttp.proxyHost=betacraft.uk", "-Djava.util.Arrays.useLegacyMergeSort=true"]
+        out["+traits"] = ["legacyLaunch", "no-texturepacks"]
+    elif version_meta["type"] == "old_beta":
+        out["+traits"] = ["legacyLaunch", "texturepacks"]
+
+    # need launchwrapper, jopt, and asm-all for these versions to run
+    out["libraries"] = []
+    for library in version_meta["libraries"]:
+        if "launchwrapper" in library["name"] or "jopt" in library["name"] or "asm-all" in library["name"]:
+            out["libraries"].append(library)
+    
+    return out
+
+with urlopen("https://raw.githubusercontent.com/skyrising/mc-versions/main/data/version_manifest.json") as ver_man_req:
+    version_manifest = json.loads(ver_man_req.read())
+    for version in version_manifest["versions"]:
+        meta_id = version["id"]
+        meta_filename = meta_id + ".json"
+
+        # skip server versions and versions that are already there
+        if meta_id.startswith("server") or meta_filename in net_minecraft_files:
+            continue
+
+        print(f"Found OmniArchive version {meta_id}")
+        meta_url = version["url"]
+        with urlopen(f"https://skyrising.github.io/mc-versions/{meta_url}") as ver_meta_req:
+            version_meta = json.loads(ver_meta_req.read())
+            # some server versions don't start with "server" for some reason, but they all don't have assetIndex
+            if "assetIndex" not in version_meta:
+                continue
+
+            meta_obj = gen_compatible_meta_obj(version_meta)
+            with open(os.path.join(PMC_DIR, MINECRAFT_COMPONENT, meta_filename), "wt") as meta_json_file:
+                meta_json_file.write(json.dumps(meta_obj, indent=4))