1. Here is a list of best free STEP file viewer software for Windows and STP viewer software for Windows.STEP files and STP files are more or less the same formats. STEP files and STP files are widely used to design 3D diagrams, so they require special software in order to be viewed.
2. Download File Viewer for Windows now from Softonic: 100% safe and virus free. More than 32 downloads this month. Download File Viewer latest version 2017.

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My-file.extYou're trying to open a file you've received through an email attachment or a file on your hard drive, but your computer won't let you do it. You get an annoying pop-up window that says, 'Windows can't open this file'.The reason why you can't open your file is because you don't have the EXACT program to open that EXACT file extension. What could be more frustrating? The SolutionFinally. There is a way to open ANY file 1 on your computer - without constantly having to buy expensive and complicated programs (many costing $500 or more).FileViewPro lets you open all kinds of files - videos, music, photos, documents, and much more. There's no need to buy several programs when ONE program does it all. Never struggle to open a file again!now to open your file instantly!