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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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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0answers
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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votes
1answer
499 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 ...
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votes
5answers
5k views

How do I unassociate a program from a file type?

If I have a file.class and I opened it with Notepad, how do I destroy that association so that Notepad is not associated with .class? I do not want to change the .class association to another program -...
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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 ...
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votes
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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votes
2answers
435 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
53 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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votes
15answers
26k 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 ...
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votes
3answers
7k 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 ...
68
votes
10answers
251k 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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votes
2answers
2k 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 ...
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2answers
31 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
29 views

Is there any kind of file that can hold calendar information (appointments or so)?

I am looking for a type of file that can hold calendar information (such as appointments) and when opened by a calendar application (such as outlook or similar apps) either on desktop or mobile it ...
98
votes
8answers
26k views

File extension for Markdown files?

Is there an official file extension for standalone Markdown files?
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1answer
168 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 ...
6
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1answer
4k views

Is there a difference between .JPG and .jpg?

Files that have uppercase extensions (specifically .JPG) are not opening or being recognized in Windows Live Photo Gallery. .jpg files work as expected. What could be causing this issue?
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2answers
105 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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1answer
335 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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0answers
70 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
3k 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 ...
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votes
1answer
2k views

osx - stop xcode from opening ruby files

I have set my favorite text editor as the default application to open ruby files (.rb extension) multiple times by following Open With -> then Other... then I click the checkbox Always Open With. ...
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votes
3answers
8k 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
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 ...
0
votes
1answer
698 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

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-...
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 ...
0
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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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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 ...
0
votes
1answer
36 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 ...
0
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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 ...
3
votes
3answers
4k views

Way to search & find Files or Folders with no Extension in Windows

How do i search files with no extension? For best effect i would like only <4kb and if i could search inside for the text thewordiwant I also have visual studios but i dont think writing ...
2
votes
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 ...
6
votes
3answers
4k views

Searching for Extensionless Files in Windows 7

I cannot for the life of me figure out a way to have Windows 7 Explorer search for files with no extension. In XP it was nice and simple: just search for files named *. but in 7, that does not work ...
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vote
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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2answers
4k views

How do I add file types to Windows 8 “File Associations”?

I am trying to associate .scss files with my text editor, but the file extension is not listed under Control Panel > Programs > Default Programs > Set Associations How can I set this ...
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vote
1answer
702 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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vote
1answer
426 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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votes
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 ...
0
votes
2answers
1k views

How to open .BNDL files

I want to edit a .BNDL file in windows 7 but when I open it with notepad or Microsoft Office 2010, I get a file with weird characters. Is there a way to edit this file in windows? Regards
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votes
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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3answers
344 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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votes
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 ...
18
votes
4answers
19k views

Find files filtered by multiple extensions

What is the correct syntax for: find . -type f -name \*.\(shtml\|css\) This works, but is inelegant: find . -type f -name \*.shtml > f.txt && find . -type f -name \*.css >> f.txt ...
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vote
1answer
359 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 ...