diff --git a/.gitignore b/.gitignore
index f8b73e7..630a2ad 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
+.idea/
+testing_data/
+
 # ---> Python
 # Byte-compiled / optimized / DLL files
 __pycache__/
diff --git a/piston.py b/piston.py
new file mode 100644
index 0000000..638522f
--- /dev/null
+++ b/piston.py
@@ -0,0 +1,95 @@
+import platform
+from pathlib import PurePath, Path
+from os import getenv
+import json
+import uuid
+from zipfile import ZipFile
+import datetime
+import logging
+
+# Launcher/Install profiles are found in .minecraft/launcher_profiles.json
+
+
+def get_sysroot():
+    if platform.system() == 'Windows':
+        if getenv('APPDATA'):
+            return PurePath(getenv('APPDATA'))
+    if platform.system() == 'Darwin':
+        return PurePath(Path.home(), 'Library', 'Application Support')
+    if platform.system() == 'Linux':
+        return PurePath(Path.home())
+    return None
+
+
+def get_minecraft_folder(sys_root):
+    return sys_root / f"{'' if platform.system() == 'Darwin' else '.'}minecraft"
+
+
+def get_installs(minecraft_folder):
+    with open(minecraft_folder / 'launcher_profiles.json') as f:
+        json_data = json.load(f)
+    return json_data.get('profiles')
+
+
+def get_modpack_id(modpack_name, install_list):
+    for install in install_list:
+        if modpack_name in install_list[install]['name']:
+            return install
+    return None
+
+
+def main(modpack_path):
+    # Get Minecraft Install Location
+    sys_root = get_sysroot()
+    if not sys_root:
+        sys_root = input("Unable to locate your minecraft install - please enter it here: ")
+
+    logging.debug(f"System path set to: {sys_root}")
+
+    # Get Modpack Name from zipfile:
+    modpack_name = modpack_path.stem
+    logging.debug(f"Modpack name extracted as: {modpack_name}")
+
+    # Get Minecraft Installs
+    install_list = get_installs(get_minecraft_folder(sys_root))
+    modpack_id = get_modpack_id(modpack_name, install_list) or uuid.uuid4().hex
+    logging.debug(f"Modpack ID extracted as: {modpack_id}")
+
+    install_path = sys_root / '.moddedminecraft' / modpack_name
+    logging.debug(f"Modpack install path set to: {install_path}")
+
+    # Check if modpack is already installed
+    if modpack_id not in install_list:
+        logging.info(f"Modpack {modpack_name} ({modpack_id}) not found in install list - creating...")
+        install_list[modpack_id] = {
+            'created': datetime.datetime.now().strftime('%Y-%m-%dT%H:%M:%S.%f')[:-3] + 'Z',
+            'gameDir': install_path,
+            'icon': 'Redstone_Block',
+            'javaArgs': '-Xmx4G '
+                        '-XX:+UnlockExperimentalVMOptions '
+                        '-XX:+UseG1GC -XX:G1NewSizePercent=20 '
+                        '-XX:G1ReservePercent=20 '
+                        '-XX:MaxGCPauseMillis=50 '
+                        '-XX:G1HeapRegionSize=32M',
+            'lastUsed': '',
+            'lastVersionId': '1.16.5-forge-36.0.43',
+            'name': modpack_name,
+            'type': 'custom'
+        }
+        with open(get_minecraft_folder(sys_root) / 'launcher_profiles.json', 'r') as f:
+            full_profile_setup = json.load(f)
+        with open(get_minecraft_folder(sys_root) / 'launcher_profiles.json', 'w') as f:
+            full_profile_setup['profiles'] = install_list
+            json.dump(full_profile_setup, f)
+        logging.info(f"Successfully added mod to installed profile list.")
+
+    # Validate file structure compared to mod zip
+    with ZipFile(modpack_path, 'r') as zip:
+        logging.info("Validating mod files...")
+        Path(install_path).mkdir(parents=True, exist_ok=True)
+        zip.extractall(install_path)
+    logging.info("Validation Completed.")
+
+
+if __name__ == '__main__':
+    main(PurePath() / 'testing_data' / 'FusterCluck_test.zip')