Questions tagged [file-extension]

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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Rename Application option in "Open With" menu

So I don't want to change the default program that opens the file type. Problem Right click → open with → photoshop But which one is the 64-bit version? Maybe if I go to Choose default program I'll ...
Raystafarian's user avatar
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1 vote
1 answer
2k views

Exclude all variations of file extensions with Robocopy

Robocopy seems to sometimes automatically wildcard file extensions when filtering. For example, using ".m" gets "filename.m" and not "output.mat". However, ".txt" gets "filename.txt" but also "...
Dan C's user avatar
  • 15
8 votes
2 answers
3k views

Changing icons for protected file extensions in Windows 10

The goal is to get .jpg, .png, .tif, and .raw files to always open with Photoshop CC 2015 and use their appropriate icons. You can refer to the flowchart below about how Windows 10 chooses an icon ...
Mike's user avatar
  • 241
4 votes
2 answers
3k views

How to add missing file extensions for multiple files using ExifTool in Windows

I lost only the file extensions at the end of the file names for a few thousand .docx and .pdf files. So how do I attach them in one batch at the end of the existing FileName using ExifTool ? Note 1. ...
adobh's user avatar
  • 43
3 votes
2 answers
607 views

CTRL + A to select a whole file name doesn't work for icons on the desktop

I want to rename a file with its extension using CTLR + A to select whole name, but it doesn't work on the desktop. I'm using WIN7, and this process just doesn't work when a file is on my desktop.
Arash Rabiee's user avatar
18 votes
1 answer
79k views

Search for files with a specific file extension in Windows 7 [duplicate]

In Windows Explorer, I would like to search for all files in a specific folder and its subfolders with the file extension .doc. To do that, I tried to enter .doc in the search bar on the top right of ...
Donald Duck's user avatar
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0 votes
1 answer
1k views

Hide File Extensions Only On Desktop

Is it possible to hide file extensions only on a specific folder? (Desktop in my case) I want all the extensions to be shown on my PC but I have a few programs that are only an exe file without an ...
Michael Yochpaz's user avatar
1 vote
1 answer
7k views

Windows- how do I create my own file extensions, and associate them with my own program?

I have developed a C# WPF application that will display .pdf files to the user. The user can load the PDF directly File --> Load --> (select PDF file) --> Open after selecting the PDF, and ...
Noble-Surfer's user avatar
1 vote
0 answers
47 views

How to set the default program for log4j/log4net log files?

The mentioned log4j/log4net output files look like these: importer-log-file.log.2016-06-09 importer-log-file.log.2016-06-10 importer-log-file.log.2016-06-11 or exporter-log-file.txt.2016-06-09 ...
y434y's user avatar
  • 111
0 votes
1 answer
1k views

How to associate file extension in Windows 10 to arbitrary command?

I would like to set FXML files opened with Gluon Scene Builder, which exists in the form of JAR file. So, in old good Windows I would associate these files with command like javaw -jar ...
Dims's user avatar
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7 votes
1 answer
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Why does my Windows open CSS file with notepad?

In CMD I get this: C:\>assoc .css .css=CSSfile C:\>ftype CSSfile File type 'CSSfile' not found or no open command associated with it. But in explorer, CSS files have icon and I can double ...
Gqqnbig's user avatar
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3 votes
2 answers
581 views

How to make Windows Explorer treat a file with a `.MAS` extension as a regular file

I have a regular file on a Microsoft Windows 7 computer called MYFILE.MAS, as viewed from (e.g.) cmd.exe. (You can create one too, it's just an empty file). However, when viewing this file graphically ...
Mike T's user avatar
  • 785
0 votes
2 answers
296 views

Command to list all apps capable of opening a given extension

I'm building a file catalogue app of sorts, and for one of its uses I'd like to get a list of all apps currently installed capable of opening files with the extension of the currently selected file. ...
Max Steenbergen's user avatar
1 vote
1 answer
2k views

How to search for C# source code files in Windows File Explorer?

I'm trying to find some lost C# source code files on an old external drive. I believe the file extension for C# source files is .cs. When I enter in the search file *.cs and begin searching, I find ...
hippietrail's user avatar
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3 votes
1 answer
9k views

Many Personal Files turned into .micro files

Yesterday, I shut down my computer and went to sleep. I woke up today, went to school, came back and now when I turn it on, it shows this .TXT file. Many of my files have turned into .micro files, and ...
JohnD314's user avatar
15 votes
7 answers
30k views

Default save extension is "Normal Text" but Notepad++ is saving without an extension

When I try to save a file, the default extension is All types (*.*). It basically saves it without an extension, for example, just new 1 instead of new 1.txt. “Default language” option in Settings → ...
Larper's user avatar
  • 165
1 vote
2 answers
1k views

How can I detect if the extension of a file has been modified?

For example I have picture1.JPG then another user of my computer change the extension from picture1.JPG to picture1.PNG, I am sure that in most cases it will work. My question is this, is there a way ...
Cary Bondoc's user avatar
1 vote
3 answers
1k views

Bash command for finding file extensions with largest size

I am trying to find file extensions with sorted by size in a directory and sub directory. Something like this: 76K .pek ./Adobe Premiere Pro Preview Files/demo.PRV/1d860051-77c9-4acb-973e-...
suvozit's user avatar
  • 11
0 votes
1 answer
2k views

OS X El Capitan - Issues with OpenVPN and the .ovpn file extension

I'd like to set up an OpenVPN connection, but it just doesn't want to work. .ovpn files seem to be treated in a very special and odd way by OS X: When downloading .ovpn files, they're automatically ...
Marcello Mönkemeyer's user avatar
0 votes
1 answer
132 views

Sublime Text 3 Missing Extensions

I started using sublime text v3 and I'm having problems with some extensions. When I look for php/js/css/html extensions, they aren't listed in the extensions list. I reinstalled the program and they'...
Eliya Cohen's user avatar
0 votes
1 answer
80 views

How to open a .htmlENX file

I have found some .htmlENX files on my computer and I know that these are encrypted files using the Egis program. That's all I've been able to determine from the file name. These files are just chat ...
bob's user avatar
  • 1
0 votes
0 answers
108 views

How to open .exj file extension

I need to open .exj file extension. I googled and found it's associated with Java. But how do I open it to view and edit the contents of the file? One thing I am aware, it has question and answers in ...
David's user avatar
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2 votes
1 answer
1k views

Corrupted document files with a strange extension

Today I turned no my PC and I faced an strange problem. Most of my documents and files such as .jpg, .pptx, .docx, .pdf where renamed with for example "xxxxxx.JPG.dslttdk" and "xxxx.PDF.dslttdk" and ...
Mostapha777's user avatar
1 vote
1 answer
137 views

What are TQS, TQI and the TQP file extensions, and how can I open them?

I'm using some old software on windows that looks like it accesses a database to serve up some questions. I'd like be able to access the database, but when I go into the data directory there are 3 ...
James's user avatar
  • 153
1 vote
1 answer
2k 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?
Frankie Yip's user avatar
-1 votes
2 answers
246 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 ...
GuardianX's user avatar
  • 101
5 votes
2 answers
728 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 ...
Scruffy's user avatar
  • 194
0 votes
0 answers
135 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 ...
Kiss László's user avatar
-1 votes
1 answer
324 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 ...
Bj Blazkowicz's user avatar
1 vote
1 answer
2k 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 ...
Cagatay's user avatar
  • 13
0 votes
2 answers
82 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 ...
neubert's user avatar
  • 7,102
1 vote
1 answer
1k 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 ...
Andy Madge's user avatar
5 votes
1 answer
9k 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 ...
Jonas Stein's user avatar
  • 1,092
6 votes
4 answers
21k 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 ...
Nzall's user avatar
  • 2,997
2 votes
2 answers
3k 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, ...
Talha Sayed's user avatar
0 votes
1 answer
72 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 ...
Zeinab Abbasimazar's user avatar
1 vote
1 answer
736 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 ...
mins's user avatar
  • 989
4 votes
2 answers
1k 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 ...
Catpersonisme's user avatar
1 vote
1 answer
4k 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 ...
Alex's user avatar
  • 113
7 votes
2 answers
19k views

Convention for file extensions: 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 ...
rory.ap's user avatar
  • 496
-3 votes
1 answer
2k 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 ...
Diogo's user avatar
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1 vote
2 answers
826 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 ...
cshu's user avatar
  • 175
-1 votes
3 answers
282 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, ...
Noel Widmer's user avatar
6 votes
4 answers
8k 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 * ...
tristof's user avatar
  • 105
3 votes
1 answer
108 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 ...
Pokechu22's user avatar
  • 418
31 votes
1 answer
17k 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, ...
IQAndreas's user avatar
  • 3,967
1 vote
2 answers
1k 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 ...
LanceLafontaine's user avatar
1 vote
1 answer
3k 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? ...
Amirreza Nasiri's user avatar
0 votes
0 answers
126 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. (...
userJT's user avatar
  • 1,064
3 votes
1 answer
934 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?
Elmo's user avatar
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