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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Why should one prefer lower case file extensions like .jpg over uppercase ones like .JPG?

Many (most?) programs note file extensions in lower case. ls command in bash even prints foo.jpg highlighted as picture by default but not *.JPG. Lower case characters are better to distinguish from ...
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2answers
2k views

How to extract the filename without the extension from a full path?

I'm trying to right my first bash script, and at one point a filename is passed to the script as $1. I need to extract the file name without the extension. Currently, I'm assuming that all extensions ...
0
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1answer
4k views

Windows 8.1 won't start a file extension using a .jar file, eventhough it's possible in windows 7

Here is a picture of the file i want to open, and the program i want to open it with. If i just click the jar file, it opens my program smoothly (I made that java progrma my self), no questions ...
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votes
3answers
51 views

How can I change what extensions are opened by Notepad?

I accidentally configured .data and .text to be opened in Notepad by default, and I want to unlink those extensions from being opened by Notepad. However, Notepad does not appear in the list of files ...
9
votes
2answers
11k 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 ...
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3answers
7k 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? ...
0
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2answers
42 views

Does windows change files when file extensions are changed?

I have noticed that changing the file extension from one to another and back to the old one will make the file unusable. Why is it so ? Does changing the extension change the file contents ? Also, ...
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votes
1answer
17 views

how to convert .to files to a popular audio format

I have received an audio file with extension .To from a friend. I have found a player for this file type, but I want to convert it to a popular audio format in order to play it in my other gadgets. I ...
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1answer
54 views

Change file extension in Windows 7 without making extensions visible in Explorer options

Occasionally I want to change the extension for a given file in Windows Explorer, e.g. rename audio_only.mp4 to audio_only.m4a. These valid possibilities are somehow unappealing: Show extensions in ...
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0answers
16 views

saving/:w a python file in gvim is creating two of the same files with different extensions [duplicate]

When I first :w test.py My file saves on my desktop with a picture of a python script and the file type is shown as Python File. Now when I go to save my file without including the name as in :w a ...
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1answer
29 views

Finding files by only knowing extension?

I'm somewhat disorganized in my file saving habits, so I wind up using the Search function in Windows Explorer more often than one should. I was wondering, is it possible to have Windows find all ...
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votes
3answers
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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1answer
77 views

Saving .mp4 audio file as an mp3 file [closed]

If you were to save a .jpeg image as an .png image by simply changing the file extension, the image will successfully convert itself. Is there a way similar to this where I can save an .mp4 audio ...
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2answers
62 views

Convention for file extension convention: uppercase or lowercase

Is there a convention for the case of the file extension in Windows, i.e. all uppercase vs. all lowercase? If there is, what is the reason, if any, for the convention, or is it just for the purposes ...
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votes
14answers
17k 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 ...
83
votes
4answers
36k 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 ...
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votes
1answer
45 views

Why can't I turn a folder into a file in Windows?

Every time I need to create a text file in Windows I usually right-click inside a folder and select for any option from shortcut to a zip file and rename it's extension to ".txt" (I know that some of ...
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1answer
2k views

What file extensions does ffmpeg support?

I'm trying to extract a subtitle from a Blu-ray disc and it is an hdmv_pgs_subtitle. So I try ffmpeg -i file.m2ts -map 0:3 -scodec copy rip3/test.sub and get Could not write header for output ...
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1answer
27 views

How to Edit an non-extension Picture?

I have an open source application that i can edit any files on it. Now i want to edit some pictures that have no Extension! (Just the picture name can shown). and when i open them with any ...
0
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0answers
157 views

LibreOffice: How to open embedded document

I'm using both LibreOffice and MS Office 2010 on Windows 7 with .pptx extension associated with LibreOffice and .xlsx extension associated with MS Excel(I installed MS Office first, and then installed ...
48
votes
8answers
167k 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" ...
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2answers
826 views

How to get a text list of files names in a folder in windows

I have a folder that has different file formats, is there a way to get all the files names and their extensions at once instead of copying and pasting
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2answers
175 views

Does changing or removing file extension trick antivirus software?

I have little experience of antivirus software. I wish someone help me with common antivirus behaviors. For example, I have an EXE or PDF file containing virus. Does removing the .exe/.pdf or ...
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votes
3answers
71 views

Windows 7 does not update the default application path

I am developing an application in W7. My application is the default app for TIF files. That means our users can set the app as the default application to open the .tif extension. The problem is, ...
2
votes
1answer
59 views

Windows - don't hide file extensions of certain types

I want to hide all file extensions except for certain extensions/types. Is this possible? I don't like the clutter of file extensions but as a developer I find it helpful to know the extensions of ...
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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?
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3answers
2k 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 ...
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3answers
208 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 ...
0
votes
1answer
181 views

How to split multiple videos from a single VOB file?

A VOB (Video Object) file is a DVD media extension which can hold multiple videos. How can I split these videos from a single VOB file to multiple MP4 (or other extensions) files on Windows platform? ...
2
votes
1answer
48 views

How do I specify that a file extension needs to be run with a switch?

I would like to make certain open with a specific program, but that program requires a specific switch to be provided for it to actually open it. How would I go about setting this up? The specific ...
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 ...
3
votes
1answer
3k 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
115 views

how to change extension of a file in Windows?

I downloaded a perl file from some webpage by opening it in my browser and saving it. But the saved file has a file name xxx.pl.txt. How can I save it into a file with "pl" as its extension? Also ...
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votes
1answer
206 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")
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 ...
0
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2answers
39 views

What file extensions should be used on GPG generated output?

In Linux file name extensions are irrelevant, but on a Windows system, many GPG users use GUI applications rather than the command line. They may want to be able to double click on an encrypted file, ...
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2answers
94 views

Is there a disadvantage to not using text file extensions?

I recently learned that file extensions (at least for plain text) in a Unix-like environment generally don't have meaning. Whether a bash script has a .sh,.log,.txt, or .hgfjgfdjgd, it can still run ...
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0answers
526 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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votes
3answers
4k 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? ...
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votes
2answers
473 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 ...
4
votes
2answers
5k 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 ...
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vote
4answers
2k 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?
2
votes
1answer
499 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 ...
0
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0answers
32 views

More complex file extension on windows using two extension approach?

On Windows, I can have an app associated with *.txt file. So all *.txt open in AkelPad (notepad replacement). However, this editor is great but does not support international characters well. ...
1
vote
1answer
63 views

Why is the dot/period character used as file extension separator?

Why dot and not any other character? What's the historical reason behind it?
1
vote
1answer
90 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 ...
2
votes
2answers
152 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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2answers
276 views

How to restore the ability to modify the association for the .txt file extension in Windows 7 Pro?

The Problem: The Properties dialogue box for text files has lost its accustomed Change button From the list of extensions in Control Panel\Programs\Default Programs\Set Associations, the .txt file ...
0
votes
0answers
28 views

I associated Notepad to .Java files accidently, how do I undo this? [duplicate]

I am using Windows 8, I associated Notepad to open .Java files, all java files changed icon to the notepad one as a default program. I need to undo this step and make java files not associated to any ...
2
votes
0answers
109 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 ...