After converting the INDD file to PDF, you can open them and see them on web browsers, as well as PDF reader programs. These are the options you have to open an INDD file without InDesign on Windows.

How to Open an INDD File With Photoshop. Though Photoshop doesn't directly open InDesign project files, the two programs are closely related.

The new PDF-to-InDesign conversion tool is scheduled to ship worldwide in the 2nd quarter of 2007 for both Mac and Windows.