The `.obj` file format is a common, basic 3D geometry exchange format. There are many software packages able to open it, and that includes both desktop browsers and editors as well as online (web-browser-based) software. 

Please tell me what you want to do with the file (view it, use it in your design, 3D print it ) and I might be able to recommend a specific search query to find a software package that will help you.
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