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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0
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1answer
130 views

Reading a disk image without extension

I have three files that are supposed to be disks image with a .img extension. However, when I look at their properties, Windows says that it's just a file, without any extension. I tried to manually ...
-4
votes
2answers
2k views

file extension not valid . when it is

I can't open a excel file on my home computer. Every other computer I use opens the file apart from this one I use at home . I get a error message - financial.xlsx format is not valid. This is ...
38
votes
13answers
11k 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 ...
0
votes
1answer
239 views

How to run a file as executable with a different extension?

After taking a look at the listed processes in Window's TaskManager, I've noticed that there are some process that has a different extension other than .exe. I then opened the folder location of one ...
0
votes
1answer
343 views

How can I configure my mac to open files that have no extension in Sublime Text 2 (or another editor) [duplicate]

I want open ~/.profile to open my .profile file in Sublime Text 2. I know how to do this with .txt files for example, but I can't figure out how to do that with files that don't have an extension.
0
votes
2answers
146 views

How do I fix .lnk files on windows vista?

How do I fix .lnk files on windows vista? Sticky Notes and Windows Journal don't seem to work any more (apparently it's anything with a .lnk file extension). I already tried system restore, and even ...
2
votes
1answer
492 views

osx - stop xcode from opening ruby files

I have set my favorite text editor as the default application to open ruby files (.rb extension) multiple times by following Open With -> then Other... then I click the checkbox Always Open With. ...
0
votes
1answer
159 views

Default file extension for picture downloads on Chrome?

My google chrome will only save pictures as KanKan (then there's some Chinese: 图秀 or something) How do I get it back to .jpeg as a default? (the drop-down menu only says "all files")
1
vote
1answer
80 views

In the “open with” dialogue: quotation mark after an extension?

If you go to any "normal" file in windows, right-click on it, you get a menu item called "Open With..." The way it's supposed to work is, you're presented with a pop-up that offers you common ...
1
vote
1answer
26 views

What is the type of files I get when downloading the source code of .NET Framework?

I want to download the source code of .NET Framework 4. From the official website, I get the files with the extension .aspx; WinRAR is pretending that those are broken CAB files, and Windows won't ...
0
votes
1answer
201 views

Open .tdt files in Excel by default

I routinely use Excel for TDT and other formats. I've never had a problem getting Windows to open .tdt files in Excel by default; in Windows 7, it's right-click | Open with | Choose default ...
0
votes
1answer
106 views

Unselect the file type when renaming files in XP [duplicate]

In Windows XP the file extension gets selected when renaming a file. If I choose to add that extension to the Known filetypes, it doesn't show the extension but the file type still changes. For ...
5
votes
1answer
1k views

How to open file with default program from command line?

If I click on a file in a GUI file explorer, a default program is used to open it. This is useful for files which I don't know how to open from the command line. Is there a way to open a file with ...
1
vote
1answer
81 views

Figuring out a File's File Extension after it's Changed [duplicate]

Possible Duplicate: How do I find out the file type without an extension? I am wondering if there is any way for understanding for example a file is a video file after we change it's file ...
3
votes
2answers
404 views

How do I make a custom file extension open my java program?

what I'm asking is how to make any associated file type open my program with the corresponding data. For example, if you have a .doc file it opens Microsoft word with whatever is saved to that file. I ...
2
votes
1answer
2k 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
3answers
886 views

Firefox saves the file without extension

When I download a file, Firefox removes the file extension. I mean, if I download "something.pdf", it saves the file as "something". I didn't have this problem before yesterday. Any help would be ...
1
vote
3answers
1k 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 ...
0
votes
1answer
1k views

How to open/convert a .xmdx file?

I have a file that was sent to me with a .xmdx extension. Is there any way to convert it to something readable or open it with a third party application? I have never seen a file like this before so I ...
1
vote
1answer
704 views

how can i create security catalog(.cat file)

A catalog file contains a list of files and a digest of those files. A digest is a number generated by an algorithm to uniquely identify a given file, like a fingerprint. The digest is used for ...
2
votes
2answers
253 views

Details about “Hide Extensions of Known file types” from Windows Explorer

What does "known file types" actually mean? What makes a file type "known"? Can I explicitly add or remove extensions/types from the list of "known" file types?
0
votes
2answers
769 views

How to open .BNDL files

I want to edit a .BNDL file in windows 7 but when I open it with notepad or Microsoft Office 2010, I get a file with weird characters. Is there a way to edit this file in windows? Regards
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vote
3answers
430 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 ...
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votes
2answers
174 views

show file extensions in windows 8 [duplicate]

Possible Duplicate: How to display the extension of the file on windows 8 I am not able to show file extensions in windows 8.I can not find the folder options,that used to be there in ...
1
vote
2answers
170 views

Is there some way Linux editors can tell the programming language without the file extension?

I am editing some scripts on Linux without the languages file extensions, and it seems that the editors, namely vi, nano and gedit are not applying syntax highlighting because the filenames don't use ...
4
votes
3answers
448 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 ...
2
votes
2answers
147 views

How to add extensions to a lot of files using content of each file?

I've got over 10,000 files that don't have extensions from older versions of the Mac OS. They're extremely nested in file structure, and they also have all sorts of strange formatting and characters. ...
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votes
3answers
687 views

How to open a file without any extension in windows 7? [closed]

I recently downloaded a file but it just looks plain, i mean no icon like winzip or anything and in the 'Type' column it just shows 'file'. i have no clue how to open such kind of file.
3
votes
1answer
1k views

Midnight Commander on OSX - bindings for file extensions and arrows

I am using Midnight Commander on Mac OS X (version 4.8.4) I have two problems and I would be very glad if you can help me: First: The binding for file extensions are set for Linux distribution. ...
2
votes
1answer
403 views

Notepad++ find in files filter for files with no extension

I'm using Notepad++'s "Find in Files" functionality to find specific text in a large number of text files across a large number of directories and subdirectories. I understand how to specify file ...
5
votes
2answers
465 views

Windows file association for README, INSTALL, LICENSE and the like [duplicate]

Possible Duplicate: How to set the default program for opening files without an extension in Windows? Many files originating in the UNIX world come without file extension. Popular examples ...
1
vote
2answers
217 views

Default file extensions in .bash_profile

I use Mac OS Lion and I would like to declare in my .bash_profile the file extensions and the default application to open them. For example, I want to associate all .txt files to TextMate so that ...
1
vote
1answer
91 views

What is a good file extention for CLI PHP programs?

I use PHP for some OS scripting, is there any proper file extension other than .php for PHP cli programs? So I can assign php.exe to run these kind of files directly. Is .phps a good candidate? I ...
0
votes
1answer
730 views

How do I open a BDC file?

I have a file with a .bdc extension. I've read that it's some kind of dictionary file, but I have no clue what software I can use to open it. Can someone help me out?
1
vote
1answer
195 views

Default program not choosing on Windows 7

I have a file with a .kv6 extension. I used Slab6 (the correct and only program) to edit this file. Slab6 was set as the default program to open it upon double click, but today it stopped using that ...
2
votes
0answers
103 views

Identify recovered filetype

I'm searching some info about this file. It was recovered from a failed HD, with Ontrack EasyRecovery. The file extension may not be accurate. I tried with TrID (I'm the developer), and based on the ...
4
votes
1answer
122 views

Windows explorer displays application path instead of file type

Windows explorer in Type columns sometime displays Type name like: "XXX File", sometime displays associated application name like "Adobe Acrobat Document", and for some application it displays full ...
1
vote
3answers
90 views

What file types could possibly be a worm or contain a viral infection

On Windows what file extensions do you have to look out for concerning viruses/worms? I ask because I'm wondering if there's a point in scanning .cfm files.
30
votes
4answers
31k 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 ...
9
votes
2answers
8k 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 ...
1
vote
3answers
5k views

how do I determine the file type of a video file [duplicate]

Possible Duplicate: Tool to view video/audio file information Sometimes I get the url of a video embedded in a webpage and download it, just to find the file has no extension name. I can ...
0
votes
1answer
494 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 ...
10
votes
2answers
3k views

Show/hide extension of a file through OS X command line

I'm looking for a way, via terminal, to change whether or not a specific file's extension is shown in the Finder, something along the lines of: $ hideextension ~/music/somesong.mp3 Without having ...
6
votes
3answers
3k 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? ...
6
votes
1answer
2k views

Is there a difference between .JPG and .jpg?

Files that have uppercase extensions (specifically .JPG) are not opening or being recognized in Windows Live Photo Gallery. .jpg files work as expected. What could be causing this issue?
1
vote
2answers
2k views

Change Icon of *.dll Back To Original

My idiotic little brother opened a *.dll file with notepad, now it's got that NotePad icon on it. It's a real mess because now I can never distinguish between *.dlls and text files. How do I change ...
0
votes
1answer
379 views

How do I save an HDR file for the web?

I made an HDR picture by combining three images in Photomatrix, but I don't know how to use the resulting .hdr file. Moreover, when I open it in phtoshop, it only displays the first image of the ...
1
vote
5answers
18k views

Excel 2010 File Format/Extension Not Valid. Unable to Manually Change File Extension

I am at work and having problems opening an excel file. I continue to get the error: Excel cannot open the file XXX.xlsx" because the file format or file extension is not valid. Verify that the ...
4
votes
2answers
1k views

Searching for Extensionless Files in Windows 7

I cannot for the life of me figure out a way to have Windows 7 Explorer search for files with no extension. In XP it was nice and simple: just search for files named *. but in 7, that does not work ...
0
votes
1answer
582 views

Opening a .osx file in default program

I'm trying to run Fluenz on my computer and it's a .osx file. When I try to open it, it opens in Textmate. Kind of odd. Does anyone know how to restore its original default program? I think that I ...