This week's book giveaway is in the Java in General forum. We're giving away four copies of Beginning Java 17 Fundamentals: Object-Oriented Programming in Java 17 and have ishori Sharan & Adam L Davis on-line! See this thread for details.
This isn't really Java networking. The first problem you have is that file: expects forward slashes only after the colon like file:/. Next, I think (and this I can't test right now I'm afraid) that you're better off using forward slashes for all of the slashes. Windows will translate it correctly.
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