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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Odd Appearances in HKEY_CLASSES_ROOT\

I am familiar with HKEY_CLASSES_ROOT\ and aware of how it works. What I am unable to understand is how some items arrived here. Was wondering if someone knew of an anterior method or how in the world ...
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1answer
43 views

Is there any way to restrict user from changing file extensions in Windows XP, Vista, Windows 7?

For example, not allow users to rename abc.doc to abc.jpg? Is there any windows group policy for that?
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2answers
33 views

Opera doesn't let me change default browser for html pages

Basically, title says it all. I have to move from Opera browser to Mozilla Firefox, but I'm unable to switch default application for html and htm pages. When I do this from standard file dialog, the ...
5
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2answers
196 views

Remove Suggested Programs for Unknown File Extensions

I regularly introduce all kinds of new, obscure file extensions to my system. For this explanation, I do not have any association with .xyz files. Say I create file.xyz. It has the default dog-eared ...
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0answers
57 views

How to open a WMP file?

I have some old photos in WMP files. I have tried the suggestions from here: http://fileinfo.com/extension/wmp But none of them worked. Is there any way to open them at Windows 8.1? EDIT: I have ...
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1answer
54 views

How accurate is content sniffing in order to determine filetype?

I need to identify the mime-type of extensionless files(document fileformats such as PDF, doc, docx etc), and I am wondering how accurate known file-signatures are? What I will do is to create a map ...
1
vote
1answer
61 views

7zip Batch Compression for a specific file extension in different folders

I've already learn how to batch compress my files as-is with 7zip but I have something more complex need on this issue. Maybe I can explain my needs with this scenario; I have a backup folder of my ...
0
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2answers
27 views

making it so i'm always prompted for which program to use when opening files with certain extensions

I opened up a *.php file with Notepad in Windows 8.1 and now it's wanting to open every *.php file with Notepad. I can change the program it opens *.php files up with but I don't want it to always ...
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1answer
36 views

Always show file extension for screenshots

If you take a screenshot with ⌘+⇧+4 the file is saved as a .png to the desktop, but the extension is hidden. You need to open the Info dialog and untick "Hide extension" if you want to show the ...
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1answer
72 views

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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3answers
87 views

How can I unassociate a file type from a program without a registry edit?

I accidentally configured .data and .text files to be opened with Notepad by default. I want to unlink those extensions from being opened by Notepad. However, Notepad does not appear in the list of ...
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2answers
53 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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1answer
20 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
82 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
34 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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1answer
110 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
153 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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1answer
57 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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0answers
205 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 ...
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2answers
188 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
92 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, ...
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3answers
364 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 ...
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1answer
57 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 ...
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2answers
53 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
130 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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1answer
241 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? ...
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0answers
39 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. ...
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1answer
75 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?
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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 ...
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2answers
377 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 ...
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0answers
58 views

kdevelop: Treat file extension like *.icc as ordinary C++ source file

I have some interface files which are called *.icc. How do I persuade kdevelop (4.3.1) to just treat these as ordinary (C++) source files? When I try to open such a file, kdevelop complains ...
2
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2answers
319 views

How can I open a file with Notepad without permanently associating its extension with Notepad?

I’m a developer; I basically work in a Windows 8 environment with several virtual machines running Linux, Windows, etc. I want to prevent Windows associating new file extensions. That is, if I want ...
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1answer
252 views

Incorrect File association for .exe files in Windows

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 ...
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0answers
254 views

How do I open the file with extension .srdt?

Can someone help me out with this. I urgently needed to access a set of files with extension .srdt. I have already tried TrID and it shows the file to be of (zip) type. However I do not know which ...
0
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0answers
42 views

How to change '.py' file from 'PY File' to 'Python File' in Windows? [duplicate]

I want to implement drag and drop of files onto a Python3 script. I noticed that my Windows7 64bit does not recognize '.py' as 'Python File' but as 'PY File' (Windows is just capitalizing the file ...
0
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1answer
51 views

How to set a default Application for an File Extention in Windows 7?

How to set a default Application for an File Extention (for example *.aaa , *.bbb , *.ccc ,...) in Windows 7
1
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2answers
575 views

right click on program > “%1” %* instead of run

I have windows 7 and downloaded a program (.exe possibly containing a virus), but didn't install it. Then I right clicked on the program > open with > notepad (always use this program not selected), ...
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2answers
4k views

How can I convert prnx file to excel?

I have sales reports with a .prnx extension. I want convert them to Excel format. How can I do this?
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votes
1answer
395 views

What is .zix type of file and how to open it?

I am having a tough time searching through internet , "How to extract a .zix file ?". I herd of winzix but that's more of a BAD - ware (virus, adware ,...etc) then, after a real hard time I found ...
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1answer
30 views

Autofix file extensions based on content

Is there an app/script what will peek at file content and try to guess the correct file extension? I have a bunch of files recovered from a backup and it's a mix of images, videos and documents. The ...
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2answers
1k 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
0
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0answers
161 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 ...
2
votes
1answer
63 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 ...
1
vote
3answers
94 views

moving a file based on its extension in BATCH

I am making a batch script to move files based on their extension, so for example: video.avi would go to Videos text.txt would go to text files I am using the drag and drop technique of getting the ...
0
votes
1answer
787 views

Add context menu items to specific file extensions

I think the title says all I want: I want to add context menu items for a specific file type like the yellow marked ones in the screenshot. Which registry changes do I have to make? In my case I want ...
0
votes
1answer
5k 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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2answers
3k 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 ...
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vote
1answer
121 views

What are the default programs to open docx, PDF and ZIP files on OS X?

I'm writing an article about DOCX, PDF and ZIP extensions. But first, I need to know the programs which are used to open these extension as default (without any third-party applications). I don't ...
0
votes
1answer
101 views

How to associate a file extension to be opened with a batch script?

I want to get rid of OSPPSVC (Office Software Protection Platform Service). Then, I have replaced the links to open Office programs with a link to launcher.bat: @echo off title Launching Office... ...