file extension - renaming the file to “Example” with no file extension - and Windows won’t know what to do with the resulting file. Windows knows it’s a text file because of the. For example, you might have a text file named Example.txt. Windows ignores MIME types, relying only on file extensions. RELATED: How Hackers Can Disguise Malicious Programs With Fake File Extensions Try to run it as a program and it won’t run. Open it in a text editor and you’ll see gibberish. For example, a PNG image needs to be opened with an image viewer that supports PNG files. A “file type” is simply information associated with a file that tells the operating system and programs how to interpret these 1’s and 0’s. The file system associated a file like “Document.pdf” with a chunk of these 1’s and 0’s.
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