Converting FBX (Filmbox) files to STEP (Standard for the Exchange of Product) format is a common task in the CAD and 3D modeling world. Here's how you can do it:

1. Use a specialized software: There are several software programs available that can convert FBX to STEP. Some popular choices include Autodesk Fusion 360, SolidWorks, and CATIA. These programs often have built-in tools or plugins that allow for easy file conversion.

2. Online conversion tools: If you don't have access to specialized software, there are also online conversion tools that can help you convert FBX to STEP. Simply upload your FBX file to the website and follow the instructions to convert it to STEP format.

3. Consider file compatibility: When converting FBX to STEP, it's important to consider file compatibility and ensure that the resulting STEP file can be opened and edited in your desired CAD or 3D modeling software.

4. Check for accuracy: After converting the file, it's important to check for any potential errors or loss of data. Make sure that the conversion process has accurately preserved the geometry, materials, and other important details of the original FBX file.

By following these steps, you can easily convert FBX to STEP and continue working on your CAD and 3D modeling projects with ease. Whether you choose to use specialized software or online conversion tools, the process is relatively straightforward and can save you time and effort in the long run.