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This page you are on right now uses a little bit of JS to transform the link the user input into a string of complete garbage, then slap that into the arguments of the page grantholtes.com/run$main.exe.html.
When you visit the link above, it digests the garbage in the arguments and turns it back into the useful link that you originally input, then redirects you there after adding any required prefixes to the URL. I mean, it’s hardly useful, it makes links longer and potentially blacklisted by Facebook. But it was rainy today, so have this, the product of 2h of my life.