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How do I make and run my own file extension?

Fresh5 days ago
Mar 15, 2026107671 views
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Problem

I was checking out the files in a old game called Warcraft III and saw that they had files with their own extension, for example, . How do you make your own file extension and run it?

Error Output

file name.w3x

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1 Fix

Canonical Fix
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New Fix – Awaiting Verification

Fix for: How do I make and run my own file extension?

Low Risk

In short: you make your own file extension by applying whatever letters you want to the end of the file name. You run it by telling your OS what program should be called when you double-click on it. Full explanation: A file extension is actually jus…

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