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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593 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 ...
7
votes
3answers
1k views

“file.myext” is not a valid Win32 application

I have written a registry that creates .myext. Double-clicking on my file.myext refers to my executable file (converted from a batch file that opens a .jar) which then opens my notepad application. ...
1
vote
1answer
126 views

Why do I sometimes get double extension names in OS X?

Sometimes when downloading files, I end up with a file like "foo.txt.txt". Sometimes I end up with just "foo" (and then manually change the extension later). Is this a common problem with OS X? What ...
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vote
1answer
515 views

Make the extension .fw.png open in a different program to .png?

I want files ending in .fw.png to open in Adobe Fireworks but I want regular .png files to open in my standard image viewer program. Is this possible?
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votes
1answer
1k 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 ?
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vote
1answer
471 views

How do you open or view the contents of .ch3 files?

We have some Harvard Graphics containing documentation from a legacy system. How can I open or view the contents of these .ch3 files? Or has the file format gone past deprecation?
2
votes
1answer
5k views

What's the difference between an *.ova file and a *.ovf file when exporting from VirtualBox?

I'm trying to export a Virtual Machine I have on VirtualBox so I can back it up, and when I went to export it, I was prompted with a "Save As..." dialog that asks me if I want to save it as a .ovf or ...
0
votes
1answer
465 views

Missing File extension in list for Select Default Program

Can't open xls files. Go to Set Default Program but the file extension isn't in the list and can't find a means of adding it. This seemed to happen after an auto Win 7 update. Any ideas?
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votes
2answers
4k views

Automatically hide files with certain extension in Windows

Is it possible for Windows to automatically hide files with a certain extension? Let's say some program generates a set of files (I cant alter the sources of the program), and I would like some of ...
3
votes
1answer
385 views

How do I rename a file or folder to .something in Windows 7?

When I try to rename a folder to .svn or a file to .myemacs, for example, a popup says: You must specify a file name. Do you have a workaround ?
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votes
1answer
1k 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 ...
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1answer
90 views

Handling files without an extension

I'd like to know how Windows XP, Vista and 7 handle files without a file extension. I'd test it myself, but I don't have access to a Windows machine currently. To my knowledge, Windows XP throws up ...
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4answers
1k views

What are the most popular file extensions for COMPRESSed files? [closed]

I was just wondering, what's the difference between these file formats? Shouldn't there be just one or two that generally tend to perform superior to most others?
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votes
4answers
385 views

Are you allowed to come up with any desired file extension (for Unix, Linux, Windows)?

I want to create a file called "message" that contains text only. How does the system know what program to use to read it if I decide to call it: message.txt? message.dat? message.enc? message.cpz? ...
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votes
2answers
665 views

How does a file have no extension?

Take for instance: cat /etc/passwd Why doesn't this file have an extension such as *.txt*, *.dat*, etc? Or does an extension exist, but it's just being hidden? Does this apply strictly to ...
0
votes
2answers
387 views

What are the alternatives of .txt?

For some reason, I can't save .txt files on my web server. I have a text file hosted on my web server, but the ending is not .txt I was wondering what ending should I choose, so that whoever sees ...
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votes
0answers
364 views

How can I unarchive .IAB files?

I'm attempting to recover data for someone and was given a backup hard drive filled with .IAB files. I've searched Google and have tried tar and gunzip on OS X 10.6 but with no success. How can I ...
8
votes
4answers
981 views

Get Windows to treat files with the same extension differently

Multiple programs use the same file extension, but the formats are totally different and incompatible. For instance, I have .sch files on my computer that are in at least 5 different formats (TINA, ...
8
votes
2answers
5k 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 ...
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0answers
502 views

How to open a .HM file in Windows7?

I've been sent a document as a .HM file, this is most likely an "Unknown Apple II File" rather than "Windows Help Context IDs" (used by MAKEHM.EXE.) Are there any other applications that save ...
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1answer
3k views

How to extract the filename extension out of %f in script?

The windows %%f returns the full name of the file as 'filename.ext' e.g. for /r %%f in (*.wav) do echo %%f Is there a way to extract the filename without the extension from %%f?
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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 ...
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3answers
429 views

Does “show all filename extensions” actually work in Mac OS X?

Quite simply, the option in Finder prefs to show all filename extensions is checked, but sometimes when I save something, e.g. a text file, and don't explicitly specify a filename in the save dialog, ...
7
votes
3answers
391 views

Why does Windows append .php to my php files but not other ones

I have many different types of files in a folder - .php, .css, .htm, .js, .docx, .xls, etc. The only file type that Windows (viewed from Windows Explorer) actually shows the extension are the .php ...
3
votes
1answer
2k views

How to set a default file extension for a specific download?

I'm using chrome web browser and when I download a file it saves the file with .jsp extension. Everytime I have to change the extension to my desired extension (i.e. .ica). Just setting the default ...
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votes
3answers
15k views

Differences between TIFF,TIF,tiff,tif

I have seen TIFF files having various extensions - TIFF,TIF,tiff,tif. Are they same? Can I safely rename a file with TIFF extension to tif or will it cause loss of information?
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vote
1answer
433 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 ...
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0answers
105 views

photo is saved in memory card but i cant see [duplicate]

Possible Duplicate: How to open nokia photo images with .nrw extension? I have a photo in a memory card, but I can't see it. It's file format is .nrw, where is it stored? How can I get ...
2
votes
3answers
2k views

changing the nature of .dat file

Some time ago I changed the way my computer reads .dat files by forcing it to always open with KM player. Now, if I save a .dat file in my laptop, its properties says that its a KMP-MPEG file. I want ...
72
votes
4answers
27k 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 ...
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 ...
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vote
1answer
6k views

File extension for file to be run by terminal?

If I want a series of commands to be run by terminal, instead of writing it in a text file and copying and pasting it in there, could I have terminal run it? If so, what does the extension have to be? ...
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votes
2answers
4k views

Google Chrome has taken over all HTML handling…

It's really getting on my nerves, but Google Chrome has taken over all HTML handling. For example, when you open Spotify... it runs C:/Users//AppData/Local/Spotify/flashdetect.html, but now that page ...
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1answer
488 views

Where can I get AA or AAX file format?

I need to test a AA and AAX file format for iphone testing. I tried google searching with filetype:aax. But I could't find it easily. Where do I find these samples?
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2answers
2k views

Remove association with blank file extension?

The launcher for Mass Effect 2 mistakenly associates itself with files with no extension. The game's patch apparently fixes this, but it's too large for me to download on this connection. How do I fix ...
74
votes
7answers
18k views

File extension for Markdown files?

Is there an official file extension for standalone Markdown files?
3
votes
1answer
1k views

Rename file in XP, only select file name, but show file extension

So if I have a file called: test.txt and I want to rename it, there are two options (depending on the Show already known file extension option): 1) ON: it selects everything (test.txt), meaning I ...
2
votes
1answer
1k views

Create new extension association and icon in SnowLeopard

I was searching for the best way to add a new file extension type (.xyz) and associate an icon to all files of that kind in SnowLeopard.
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4answers
2k views

What are .ddoc file extension?

I received file with extension .ddoc instead of .xls or .xlsx. So - what are .ddoc files? Are they even related to Microsoft Excel?
1
vote
1answer
678 views

Why Does DreamWeaver CS5 Discriminate between File Extensions, Even After Modding Mime Types?

Hi folks, Even After I forced DreamWeaver CS5 to allow opening of .ast extensions as a MIME type of php5, which DreamWeaver now opens and colors correctly as described here, I still have trouble ...
8
votes
3answers
2k 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
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
1answer
2k views

Firefox appending .xls extension to .xlsx files

We are serving files with the .xlsx (excel 2007/2010) extension. IE, Chrome, Safari all download the file and open excel just fine. For some reason Firefox is appending .xls to the extension. I ...
0
votes
1answer
979 views

How to remove file association and display the file extension in Windows 7

The default behavior when set file association for a file type, in explore the extension won't show in file name again. Is there any way to let the file extension show again? In Windows XP this can be ...
6
votes
6answers
35k 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?
2
votes
1answer
2k 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 ...
5
votes
2answers
1k views

Hiding files of a certain extension (.pyc) from Nautilus

I would like to hide every .pyc file from Nautilus. I use Ubuntu 10.04. What could I do?
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vote
2answers
380 views

Google Chrome mistakenly adds extra .gz at the end of downloads

Every time I try to download a .gz file, Chrome appends an extra .gz at the end of the filename Is this a known bug? Any workarounds?
2
votes
5answers
422 views

Detecting if a .bin file is .atrac (audio)?

I want to detect if .bin files are atrac or not. How is this possible? Is anyone here familiar with the .atrac extension? Would a hex editor help? EDIT: It is to my understanding that .atrac files ...
2
votes
2answers
670 views

Same filename with a different extension

I have a fairly large collection of music, some of which I have ripped at different times with different software. Through all my updates and additions to my collection, I have ended up with a ...