File extensions are
the three letters that come after the dot in a file name. For example,
a setup program might be called something like setup.exe. The ".exe"
is the file extension.
Extensions are used to let the computer know what type of file it's dealing
with. For example, if it's a ".jpg" file, the computer knows
it's an image file. If it's an ".exe" file, the computer knows
it's a program.
not to change file extensions unless you have a compelling reason to do
so. Changing the extension can (and usually do) make the file unusable.
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