How to get the extension of a file in windows

Question

Is there any way so that i can get extension of a given file.

if suppose there is a file "abc.txt" but after renaming the file name is "abc.exe" now the extension is .exe is there any way that i can get the original extension of a file in which it was created.

I looked for GetFileInformationByHandle but that was not much of help

Files do not have extensions, only a file's name might have one. — alk
– alk, Commented Dec 6, 2014 at 8:49
You may have a look at the source code of the 'file' command. Even though it is Unix stuff, it could give you insights. — gd1
– gd1, Commented Dec 6, 2014 at 8:57

alk · Accepted Answer · 2014-12-06 08:50:46Z

2

is there any way that i can get the original extension of a file in which it was created

No, not without any operating system add-ons or a simple backup of the file .

answered Dec 6, 2014 at 8:50

alk

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2 Comments

ajit Over a year ago

I want to block all .exe files from getting download\email attachment .I am able to do that with WFP driver. but what if someone changes .exe to .pdf then i wont be able to block as i'am blocking by matching .exe with the packet i'am receiving.

alk Over a year ago

@ajit: You might like to read this en.wikipedia.org/wiki/.exe to learn how to detect a *.exe file from inspecting a file's content.

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