diff --git a/package.json b/package.json
index 45e3371..df8e7bd 100644
--- a/package.json
+++ b/package.json
@@ -25,8 +25,7 @@
     "@electron-toolkit/utils": "^4.0.0",
     "electron-log": "^5.3.2",
     "electron-store": "^8.2.0",
-    "electron-updater": "^6.3.9",
-    "winax": "^3.6.1"
+    "electron-updater": "^6.3.9"
   },
   "devDependencies": {
     "@ant-design/v5-patch-for-react-19": "^1.0.3",
@@ -72,5 +71,8 @@
     "redux-thunk": "^3.1.0",
     "typescript": "^5.8.2",
     "vite": "^6.2.1"
+  },
+  "optionalDependencies": {
+    "winax": "^3.1.4"
   }
 }
diff --git a/src/main/quickbooks-desktop/quickbooks-desktop.ts b/src/main/quickbooks-desktop/quickbooks-desktop.ts
index 3eb864f..6353254 100644
--- a/src/main/quickbooks-desktop/quickbooks-desktop.ts
+++ b/src/main/quickbooks-desktop/quickbooks-desktop.ts
@@ -1,4 +1,3 @@
-import * as Winax from "winax";
 import log from "electron-log/main";
 
 import { Request, Response } from "express";
@@ -7,11 +6,25 @@ import errorTypeCheck from "../../util/errorTypeCheck";
 import _ from "lodash";
 import store from "../store/store";
 
+let Winax: any; // Declare Winax as any to avoid TypeScript errors on non-Windows platforms
+
+if (process.platform === "win32") {
+  Winax = require("winax");
+}
+
 export async function handleQuickBookRequest(
   req: Request,
   res: Response,
 ): Promise<void> {
-  //TODO: Add OS sysstem checking. This can only happen on windows machines.
+  if (process.platform !== "win32") {
+    res
+      .status(500)
+      .json({
+        error: "QuickBooks Desktop integration is only available on Windows",
+      });
+    return;
+  }
+
   const QbFilePath: string = `C:\\Users\\PatrickFic\\Development\\FRODO COLLISION.QBW`;
   // ||
   // (store.get("settings.qbFilePath") as string) F
@@ -81,6 +94,10 @@ export async function handleQuickBookRequest(
 
 //This set of functions works.
 export function TestQB(): void {
+  if (process.platform !== "win32") {
+    log.warn("TestQB is only available on Windows");
+    return;
+  }
   let requestProcessor, ticket;
   try {
     requestProcessor = new Winax.Object("QBXMLRP.RequestProcessor.1");