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We welcome edits that make the post easier to understand and more valuable for readers. Because community members review edits, please try to make the post substantially better than how you found it, for example, by fixing grammar or adding additional resources and hyperlinks.

You're not seeking to understand the intent of the question. He asked: "In other words, how does Windows know with which software/program it must open a certain file(type)?" He's obviously looking at understanding how Windows associates file types. This answer addresses a common Windows problem that people run into trying to control program associations when Windows stops them from doing so. The exact registry path was already provided in a different answer. If the answer above doesn't work for somebody in the same situation, this answer will be much easier.
– Brandon Hawbaker
Commented Apr 1, 2021 at 23:20
Where is it only referencing Windows 7? I see "Windows 7", "Windows XP" and "Windows" generally tagged?
– Brandon Hawbaker
Commented Apr 2, 2021 at 5:21

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create code fences with backticks ` or tildes ~
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like so
```
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```
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