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Question is how do I open any file in c#
and google gave you no answer, no example, no nothing ?
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I don't want it to be a text file I want to it to be .html, .css, .js or .php files. Would It be the same process
All those files are text files, the file extension doesn't matter.
remember: Google is your friend.
At least do basic research before asking here, we are not a free search service.