diff --git a/muiogo.spec b/muiogo.spec
new file mode 100644
index 00000000..3960d2fb
--- /dev/null
+++ b/muiogo.spec
@@ -0,0 +1,122 @@
+# -*- mode: python ; coding: utf-8 -*-
+# muiogo.spec — PyInstaller spec for MUIOGO (Windows)
+# ---------------------------------------------------------------------------
+import sys
+import os
+from pathlib import Path
+from PyInstaller.utils.hooks import collect_submodules, collect_data_files
+
+block_cipher = None
+
+# --- PATH UTILITY ---
+# Prevents build crashes if certain directories (like solvers) are missing locally.
+def get_optional_data(src, dest):
+    if os.path.exists(src):
+        return (src, dest)
+    return None
+
+# ---------------------------------------------------------------------------
+# Hidden imports — Bundling complex scientific and web libraries
+# ---------------------------------------------------------------------------
+hidden_imports = (
+    collect_submodules('pandas')
+    + collect_submodules('numpy')
+    + collect_submodules('openpyxl')
+    + collect_submodules('flask')
+    + collect_submodules('waitress')
+    + collect_submodules('boto3')
+    + collect_submodules('botocore')
+    + [
+        'jinja2.ext',
+        'pkg_resources.py31compat',
+        'pandas._libs.tslibs.np_datetime',
+        'pandas._libs.tslibs.nattype',
+        'pandas._libs.tslibs.timedeltas',
+        'openpyxl.styles',
+        'openpyxl.utils',
+        'numpy.core._methods',
+    ]
+)
+
+# ---------------------------------------------------------------------------
+# Data files — Mapping the WebAPP structure
+# ---------------------------------------------------------------------------
+# Core UI and Logic files
+webapp_datas = [
+    ('WebAPP/App',            'WebAPP/App'),
+    ('WebAPP/AppResults',     'WebAPP/AppResults'),
+    ('WebAPP/Classes',        'WebAPP/Classes'),
+    ('WebAPP/DataStorage',    'WebAPP/DataStorage'),
+    ('WebAPP/References',     'WebAPP/References'),
+    ('WebAPP/Routes',         'WebAPP/Routes'),
+    ('WebAPP/index.html',     'WebAPP'),
+]
+
+# Optional Solver Binaries (Only bundle if they exist on the build machine)
+potential_solvers = [
+    ('WebAPP/SOLVERs/COIN-OR',         'WebAPP/SOLVERs/COIN-OR'),
+    ('WebAPP/SOLVERs/GLPK',            'WebAPP/SOLVERs/GLPK'),
+    ('WebAPP/SOLVERs/model.v.5.4.txt', 'WebAPP/SOLVERs'),
+]
+
+for src, dest in potential_solvers:
+    item = get_optional_data(src, dest)
+    if item:
+        webapp_datas.append(item)
+
+collected_datas = (
+    webapp_datas
+    + collect_data_files('pandas')
+    + collect_data_files('numpy')
+    + collect_data_files('openpyxl')
+    + collect_data_files('tzdata')
+)
+
+# ---------------------------------------------------------------------------
+# Analysis & Build Configuration
+# ---------------------------------------------------------------------------
+a = Analysis(
+    ['API/app.py'],
+    pathex=['.'],
+    binaries=[],
+    datas=collected_datas,
+    hiddenimports=hidden_imports,
+    hookspath=[],
+    hooksconfig={},
+    runtime_hooks=[],
+    excludes=['pytest', 'IPython', 'matplotlib', 'scipy', 'sklearn'],
+    win_no_prefer_redirects=False,
+    win_private_assemblies=False,
+    cipher=block_cipher,
+    noarchive=False,
+)
+
+pyz = PYZ(a.pure, a.zipped_data, cipher=block_cipher)
+
+exe = EXE(
+    pyz,
+    a.scripts,
+    [],
+    exclude_binaries=True,
+    name='muiogo',
+    debug=False,
+    bootloader_ignore_signals=False,
+    strip=False,
+    upx=True,
+    console=True,
+    icon=None,
+)
+
+coll = COLLECT(
+    exe,
+    a.binaries,
+    a.zipfiles,
+    a.datas,
+    strip=False,
+    upx=True,
+    upx_exclude=[
+        'cbc.exe', 'glpsol.exe', 'coinblas.dll', 
+        'coinlapack.dll', 'CoinUtils.dll', 'Cbc.dll', 'glpk_4_65.dll'
+    ],
+    name='muiogo',
+)
\ No newline at end of file