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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11 views

How to open .rttm files?

I got sent some .rttm files a couple days ago and don't know what I need to open them. Any help would be appreciated. Thank you! (I did ask the sender, but they haven't responded and I want to be able ...
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0answers
16 views

VLC doesn't open when opening > 100 songs

I used to open music by going to some folder in the explorer (Windows 7), select all and press enter, to be played in VLC. Since recently, the songs open in Windows Media Player. Weird. The default ...
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1answer
40 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 ...
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0answers
18 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 ...
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1answer
40 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 ...
7
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2answers
438 views

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 ...
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2answers
54 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 ...
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2answers
32 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. ...
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1answer
170 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 ...
3
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1answer
8k 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 ...
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2answers
107 views

Default save extension in my Notepad++ 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 -> ...
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71 views

Group files by extension in Nemo/Nautilus

In Windows Explorer, if you click the Type column, it groups files by file extension. Unfortunately, I can't find any way to get this behavior in Linux Mint. Clicking on the Type column in Nemo just ...
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2answers
63 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 ...
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3answers
87 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-...
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1answer
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 ...
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0answers
53 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'...
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1answer
37 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 ...
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0answers
38 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 ...
2
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1answer
263 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 ...
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1answer
37 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 ...
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0answers
26 views

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
427 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
84 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
votes
2answers
301 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
63 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
67 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 ...
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1answer
360 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 ...
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2answers
49 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
131 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 ...
0
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1answer
705 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
347 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
181 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
30 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
187 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 ...
0
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1answer
57 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 ...
1
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1answer
336 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 ...
0
votes
2answers
648 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
1answer
86 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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2answers
298 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 ...
-1
votes
3answers
188 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
3answers
1k 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 ...
3
votes
1answer
77 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
212 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, ...
0
votes
2answers
296 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 ...
0
votes
1answer
533 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
60 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. (...
2
votes
1answer
151 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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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 ...
0
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2answers
743 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 ...
2
votes
2answers
559 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 ...