How do you modify user files in an ASP.NET Web Application?

So i would like to create a website that modifies some files for the user to make installing a Mod for Minecraft easier, But i am new to how ASP.NET works. I have been a hardcore c# programmer for a while now and also know HTML and PHP. I am doubtful this is even possible, but if it is i would be very grateful if someone told me how. Thanks.
 
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