The type of file is basically a language. You can translate from one language to another.
The extension (.pptx, .pdf, etc) is just a label. Taking a .pptx and renaming it to .pdf is roughly equivalent to taking a book written in Spanish and writing “this is English” on it with a marker. You can do that, but if you hand it to a person (computer program) who only speaks English (can only understand the pdf format), they’re still not gonna be able to use it.
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