A file extension is an optional alphanumeric identifier which comes after the last found period in a file name. A file extension itself does not define what type of data is in a file, but it does give a hint as to what is *supposed* to be in the file.

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67
votes
10answers
244k views

How do you remove a default program association for file types in Windows 7?

I somehow have set the default file type association for a file type in Windows 7. It doesn't appear to be possible to delete it from the "Change the file type associated with a file extension" ...
110
votes
4answers
66k views

Is there a tool that can determine the file type from containing data? [closed]

I sometimes get files from my clients that have the wrong file extension. For example, the name is image.jpg but the file is actually a TIFF image. In many cases I can clarify it by opening the file ...
34
votes
4answers
66k views

How do I find out the file type without an extension? [duplicate]

After recovering my HDD, I ended up with a lot of files with no extension. Many of them are .bin files. Is there any way to find out what file format they actually are? Many of them have no ...
19
votes
2answers
20k views

Programatically associate file extensions with application on Windows

I've just recently reinstalled Windows and in setting up my environment I've noticed that all my associations for the various programming languages I edit in Notepad++ have gone (naturally). I am ...
43
votes
15answers
26k views

Does it make sense converting a file to a higher audio bitrate?

When a certain file (mp4, flv, etc) has a 95 kbps audio bitrate - does it make sense outputing to a higher bitrate when converting to mp3 or other format (be it lossy or not)? Would this result in ...
2
votes
1answer
2k views

Is there a way to show only specific file extensions?

Call me crazy, but I'm sure I remember this capability existing in previous versions of Windows. In Windows 7, we can have file extensions Off... or On. Pick one. Is there some obscure switch ...
4
votes
6answers
2k views

How can I find out about an unknown file extension?

When I have a random file of unknown format with a file extension I've never heard of, where can I turn to find out about the extension. The obvious choice is to google the extension along with some ...
3
votes
3answers
11k views

Input Error: There is no script engine for file extension “.vbs”

I keep getting it in command prompt, any idea why and how I may resolve the issue? Windows 7 Ultimate 32-Bit
0
votes
1answer
781 views

Incorrect File association for .exe files in Windows [duplicate]

I accidentally chose 'open with this program this kind of file' for .exe files. Now, all the files with a .exe extension open with a particular program. My computer does not have an earlier restore ...
16
votes
3answers
8k views

How to extract a complete list of extension types within a directory?

Within a directory, and recursively within it's sub-directories, meaning every directory within a directory is processed, how do I compile a complete list of unique extensions within the directory? ...
2
votes
1answer
3k views

Is it possible to change MS paint's default save file type to PNG [duplicate]

Possible Duplicates: How to set default file format for MS Paint How do I make Windows pbrush default to a save-as JPG format? PNG is better than BMP in my work and I too often forgot to ...
4
votes
3answers
19k views

reset file associations to default (idx opens w/ winRar)

Does anyone know how to set file associations back to default on windows 8. Currently the file extention "idx" is opening with "winRar" & i want to reset it back to "unknown program".
7
votes
6answers
44k views

How to open nokia photo images with .nrw extension?

I took some photos with my Nokia and they stayed with the .nrw extension. How can I open this format?
3
votes
3answers
4k views

Way to search & find Files or Folders with no Extension in Windows

How do i search files with no extension? For best effect i would like only <4kb and if i could search inside for the text thewordiwant I also have visual studios but i dont think writing ...
6
votes
4answers
2k views

What does X denotes in ASPX, DOCX, XLSX, PPTX etc?

Previously there were ASP, DOC, XLS, PPT etc and now ASPX, DOCX, XLSX, PPTX respectively. What does X denotes in ASPX, DOCX, XLSX, PPTX etc?
1
vote
1answer
609 views

New text files are created with uppercase extensions

Whenever I want to create a new text file using Windows 7 Explorer’s New ⇨ Text File context-menu entry, I get a file with an uppercase extension. For example instead of New Text Document.txt, I get ...
97
votes
8answers
26k views

File extension for Markdown files?

Is there an official file extension for standalone Markdown files?
12
votes
3answers
3k views

On Windows, what filename extensions denote an executable?

On Windows, *.exe, *.bat, *.cmd, and *.com all represent programs or shell scripts that can be run, simply by double-clicking them. Are there any other filename extensions that indicate a file is ...
5
votes
3answers
793 views

Applications are being opened by IE instead of running normally

I rewrote the Question to add everything that i tried so far. Many of my applications are being opened by Internet Explorer. (not all) For example when I run Firefox.exe (from shortcut) I get IE run ...
11
votes
2answers
9k views

There is a length limit to Windows file extensions?

If I want to create a new file extension for a binary/text data file that will open on my own application (extension ".mylongfileextensionname" for example), will Windows list it with my aplication (...
8
votes
1answer
2k views

Running shortcut from command prompt without the .lnk extension (Windows)

I have created a folder (d:\shortcuts), created shortcuts for most applications in this folder and appended the folder path to the Path environment variable. Now all my applications are available from ...
2
votes
3answers
1k views

Windows wildcards with files having more than 3 characters extensions

On Windows 7, I have a directory containing the following four files: xxx.txt xxx.txt2 xxx2.txt xxx2.txt2 With the file have more than 3 character as a file extension, the behavior of the wildcard ...
2
votes
1answer
2k views

How to play .qtch files?

So I have qtch files that apparently were created with QT 7+ because they can't be played (with QT 7+ or VLC) just by renaming their extension (as fileinfo.com says). Any solution out there ?
0
votes
1answer
648 views

How to remove trailing whitespace from file extensions and folders snow?

How can I remove trailing whitespace from file extensions and folders in snow leopard ? Ideally I would be able to run a single command within a directory that would search and remove for all files ...
6
votes
3answers
1k views

What in the world is a .el8 file?

I am taking an online Latin class, and they gave me a video to watch. A .el8. What? el8? I have never heard of that in my life. It's supposed to be a video, so I tried renaming it to a .mov (Latin ...
4
votes
1answer
2k views

Creating custom file extension with windows registry

Ok, so I have been reading and googling this for a while now and I can't understand what is going wrong. I am trying to create a .int file extension in my registry so that I can add the ShellNew key ...
3
votes
3answers
3k views

How to change the extension of all selected files at once?

Its possible to rename files all at once. But its not possible to change the extension of selected files all at once. If windows doesn't support this facility .. then is there any batch script or ...
3
votes
5answers
5k views

How do I unassociate a program from a file type?

If I have a file.class and I opened it with Notepad, how do I destroy that association so that Notepad is not associated with .class? I do not want to change the .class association to another program -...
2
votes
1answer
5k views

How to automatically recover lost file extensions?

We're recoverying bunches of data from a crashed partition of which we had no backup, using a data recovery software. Files are getting recovered, but file names are lost. Is there any software or ...
1
vote
2answers
656 views

Any tool available to make renaming in Windows XP more like Mac OS X?

I've noticed 1 cool thing and OS X. When you rename a file, it automatically selects everything up until the extension. For example, attempting to rename this.is.a.file.png would preselect this.is.a....
1
vote
3answers
852 views

Sending *.exe by changing extension failed

I know you can send .exe through email by changing their extension. I've been using this often. But strange thing happen when I tried to send this specific ".exe" file. It failed!! It's this ...
1
vote
2answers
4k views

How do I add file types to Windows 8 “File Associations”?

I am trying to associate .scss files with my text editor, but the file extension is not listed under Control Panel > Programs > Default Programs > Set Associations How can I set this ...
0
votes
0answers
306 views

Can't un-associate .css extension from Visual Stdio 2013

In - Control Panel\Programs\Default Programs\Set Associations under .css file , it has Microsoft Visual Stdio 2013 as Currect Defualt - I try to change its current default under the Change ...