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I almost never caught any virus on the computer, but today I just saw a virus (I am using Windows 7):

happy cat.rmvb

(just a sample file name). Seems innocent, isn't it? But the icon is very suspicious, because I set up Win7 to use VLC to open .rmvb files, but the icon is a blue play button, so I right click on the file and look at the properties, and it says "Application".

So for the viewers of this page who wants to have a little fun to figure out why that is, stop reading here, and think how that was achieved?

So it turns out the file is named happy cat.rmvb [150 spaces].exe So the .rmvb is not really the extension. The real extension is .exe but it is hidden to the far right of the name. Oh well, I almost open it and click "OK to open" because I usually is not so afraid of .rmvb files -- or, it could have been .txt which have made me even less suspicious.

So my question is, how to avoid this kind of virus? I don't want to constantly pay for anti-virus software, and also, not all virus program can catch all virus (it may catch 95% or 99% but not all). If that simple .exe is merely simple lines of program to wipe out the whole C: drive or D: drive, there is really no way to prevent it, especially it seems innocent enough for me to approve to open it.

So the question is: how to avoid this kind of virus file, as it is really insidious.

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Click start then search for Folder Options and uncheck Hide extensions for known file types

Folder Options

Now if it has 150 spaces then three dots will be shown ... The ... means the file name is long (the actual extension for the file is .dll)

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I already have the "Hide extensions for known file types" unchecked. That's not the issue. The issue is with the "..." -- who is really careful to note that there are some "..." there really? – 太極者無極而生 Oct 2 '11 at 7:52
Make sure UAC is enabled and default is prompt for elevation for unknown publishers. This will atleast reduce the impact. – Ganesh R. Oct 2 '11 at 8:19

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