If you download a file (say, an update for your video card drivers), and
change the name from, say “xxx123.45.exe” to “vidcardupd1”, will the program
still install/run properly, or does renaming the filename affect the actual
Changing the filename certainly doesn’t change what the file is or does, but
doing so it can prevent Windows from knowing what to do with it.
I know I regularly rename downloads.
Let’s review some guidelines.
Become a Patron of Ask Leo! and go ad-free!
Your example is a good one: renaming an obscure “xxx123.45.exe” to something
that’s perhaps a little more meaningful like “vidcardupd1” is perfectly safe
and will not harm the file in any way.
However, you won’t be able to run the file until you rename it again.
The problem is that the name you’ve chosen no longer has the “.exe”
extension. It’s that filename extension that tells Windows you have an
executable file. Without that extension, if you double-click on the file then Windows
won’t know what it’s supposed to do with it.
You can certainly keep the file with this name but before you can actually
use it you’ll have to rename it again, adding that “.exe” extension.
extension is set properly.”
A more practical approach might be to keep the filename extension from the
beginning. For example you might rename “xxx123.45.exe” to
“vidcardupd1.exe“. Now when you double click on
vidcardupd1.exe Windows will know that it’s supposed to run it.
But the bottom line is that the filename simply doesn’t matter, as long as
the extension is set properly.
Now, doesn’t that imply that you can rename something to the wrong extension
and have it cause problems? Yes, indeed.
For example, if you were to rename “xxx123.45.exe” to
“vidcardupd1.jpg” Windows will now think that what you have is
a jpeg file – a photograph or other image. When you double click on it Windows
will dutifully open up your image viewing or editing program and pass it the
filename “vidcardupd1.jpg” to display. Since it’s not really a jpeg image, that
program will either generate an error or in the worse case, crash as it tries
to display what looks to it like garbage.