How To Know Which Program To Use To Open An Unknown File Extension

by Rohit Khurana on October 12, 2008



This is quite common problem that you see a file with some unknown extension and you don’t even know which program to use to open it.


Recently we wrote about how can you associate an unknown file extension with a particular program, this post is about how to find which program can open a file with unknown file extension.


Let’s see how to find a program associated with a unknown file extension.


There are different ways through which you can first find out which program is correct to open a unknown file extension


Method 1: Use a web service to find the appropriate program



1. Double click on the file and Select “Use the Web Service to find the appropriate program



This method will call a web service by Microsoft which lets you find out which program is suitable to open the file with unknown extension


Trouble Fixers Hack: You can also use this service in another way to check which program to use for a particular file extension


In the above link just change the extension txt with any unknown file extension in the above link to know which program to use to open a file with that unknown extension


Method 2: Use the web-site


1. Open the site in your browser.

2. Enter the extension of unknown file type, here in the image below by red arrow(click to enlarge the image)


3. Press Submit Query button, you will see a new page containing all the information about that file extension.


FilExt will display the complete description about that file extension and the program required to open that unknown file extension.

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{ 4 comments… read them below or add one }

Deyaa Addeen Fahmy Shedeed October 29, 2008 at 8:03 am

Thank you .

Anwar October 29, 2008 at 11:55 pm

I downloaded a song file with help of a tool. But what downloaded was without any file extension. On guess I was able to play it forcefully with mediaplayer. It is a media type file but I was unable to know what type (mp3/ wav/ flv etc.). Now how can I know what exactly the file extension should be?

Please reply me on my mail address
Dr Anwar Khan

dp November 17, 2008 at 2:10 am

Thank you………….

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