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# Issue compiling project on a 64-bit machine using Visual Studio

> Fix an app that stops working on 64-bit Windows when it uses Barcode ActiveX, by compiling the Visual Studio project for x86.

When opening an application that makes use of our Barcode ActiveX control, a dialog box appears stating that the application has stopped working. This error message occurs on projects created using Visual Studio on a 64-bit machine.

To fix the error, you'll need to compile your project specifically for x86 machines.

1. Open the **Project** menu and select the **Properties** option for your project
2. Click on the **Compile Tab**
3. Open **Advanced Compile Options**
4. Expand the **Target CPU** dropdown menu and select **x86**

Your program will have full compatibility with both 32-bit and 64-bit systems.


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