In an operating system, the means of assigning a file extension or mime type to a particular application, as a default means of opening this type of file.

learn more… | top users | synonyms (1)

62
votes
1answer
22k views

How do I get Notepad++ to associate a file type with a language? [duplicate]

I have associated .wxs files with Notepad++. So far so good. However, it doesn't remember that it should use XML syntax highlighting. How do I associate a file-type with a Language?
33
votes
7answers
71k views

How to restore Windows default Zip file functionality?

I recently lost the default file association for Zip files in Windows Vista (I think it happened when I uninstalled WinAce, but I can't be completely sure). How can I restore this association back to ...
24
votes
3answers
19k views

How do I set advanced file associations in Windows 7?

It used to be in Windows XP that I could make Warcraft III files load automatically into the game by double clicking on them. This association was made by going to file associations ADVANCED area and ...
22
votes
6answers
30k views

How do I restore .bat files as executables?

Somehow my boss convinced his workstation that the handler for .bat files was supposed to be Word. Now, when double-clicking .bat files, they're opened up in Word. What do I set the 'Opens with...' ...
20
votes
3answers
24k views

How do I set Notepad++ as the default editor?

I want set Notepad++ as the default editor. I tried to set it by right-clicking on a file, then Open With. But I did not see Notepad++ in the resulting list (even after clicking on Choose Other ...
20
votes
5answers
6k views

What program do you use to edit file associations in Vista and Windows 7?

We all know that Vista and Windows 7 doesn't let you specify custom extensions or customize them to your liking. What program do you use to edit file associations in Vista and Windows 7? EDIT: ...
18
votes
4answers
10k views

How do I make all file types open in the internal editor in eclipse?

When using the open file dialog on Eclipse, many file types open in the internal editor as expected (.java, .txt). However, others open in an external editor. For example on my system attempting to ...
17
votes
4answers
20k views

Change Windows 7 explorer “Edit” context menu action for jpg and other image file types

When I right click on a jpg file in Windows Explorer (Windows 7), I see that there is an "Edit" menu item. If I click this item, it opens the image in MSPaint. Blah. I have Paint.NET installed, and ...
17
votes
3answers
6k views

Windows 8 is losing options in the “Open with” menu after changing file associations

When I set a program to open a specific file type by default, it works (like Word 2013 for PDF files). However, when I change the default back to reader, I lose Word as an option that I can pick in ...
16
votes
2answers
10k views

What format does Google Chrome Developer Tools save data as?

I am using Google chrome's developer tools to inspect the timeline of some requests. There is the option of storing them as a .HAR file, but I could not find anything that opens it. In a browser, it ...
15
votes
4answers
6k views

How do I get ftype & assoc to match Windows Explorer?

I changed the association to use upon launching a .py file, via Windows Explorer: Tools -> Folders -> File types. Then browse to .py. Change the association to Wordpad. Now when I type the name of ...
13
votes
7answers
42k views

Why can't change the default program to open an extension in Windows 7?

I mistakenly assign Office Outlook to open my .eml files in Windows 7. But, as Outlook do not open such files, I downloaded Live Mail, but now I can not assign it to open this kind of file by default. ...
12
votes
2answers
3k views

How do you associate the .exe file extension with a program in Windows?

A few years ago I saw somebody play a prank on somebody by associating the .exe file extension with Internet Explorer. This made Internet Explorer open up every time the person wanted to start a ...
12
votes
5answers
13k views

Why are certain default application associations “locked”?

After associating my MP3 files with MPlayer using the Open with/Choose default program... dialogue I can no longer change that association using said dialogue, the Always use this [...] Checkbox is ...
11
votes
5answers
29k views

Where does Mac OS X store file association information?

I know there is a system preferences pane to manually modify the file associations in Mac OS X Leopard. However, I'm curious where does Leopard actually store these information? UPDATE: as I said, ...
11
votes
1answer
7k views

How do I change my default browser to an unlisted program in Windows 7?

I use multiple browsers regularly, so I've written a script that will open pages in whatever browser is already running (or Firefox if there is none). I want to set this script as my default browser. ...
11
votes
3answers
3k views

How do I associate all unknown file types with notepad++?

I work alot with billing and files the bank etc. send me files that have date extensions or some counter as an extension: eg file1.20110315 or file2.123 So the extension changes every time I receive ...
10
votes
2answers
17k views

Delete Windows file association using .reg file

Question: Using a .reg file, how do I completely remove a file type association? I tried e.g. deleting HKEY_CLASSES_ROOT\myextension_auto_file but that's apparently not enough. Background: On Windows ...
9
votes
4answers
2k views

Associate a File Type with a Specific Program

How do you associate a specific file type to an application on a Windows (Vista) PC?
9
votes
2answers
634 views

PDF Icon changes to blank in Dropbox folder

Strange enough, the PDF reader icon corrupts in my Dropbox folder on my Windows 8 machine. I am using Windows 8 x64 Pro. If I change the "open with" to some other reader and then back to Adobe ...
8
votes
4answers
821 views

Get Windows to treat files with the same extension differently

Multiple programs use the same file extension, but the formats are totally different and incompatible. For instance, I have .sch files on my computer that are in at least 5 different formats (TINA, ...
8
votes
5answers
4k views

Change all file type associations from one program to another

Is it possible to easily change all file type associations that are currently associated with one program to another program in one batch? In my case, I am trying to change all files types currently ...
8
votes
2answers
6k 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 ...
8
votes
2answers
3k views

TextMate file type association

I would like TextMate to recognize that RDF files are XML and highlight them as such but I can't seem to find a way to do this through the UI. Is there a way to add file extension/type associations?
8
votes
4answers
8k views

“Send to: Mail recipient” context menu not working

I have set the Mail app from Microsoft (WinRT) as the default application for mail in Default Programs. However, when I right-click on a file, and select Send to > Mail recipient I get a message box ...
7
votes
5answers
3k views

Portable file association for USB sticks?

I have a usb stick with PortableApps that I carry around between different places. But one thing that annoys me, is when I open a file (such as *.flv or *.html), either Windows says it is unsupported ...
7
votes
3answers
9k views

On OS X, how do you change a file's “Kind”?

On OS X I'd like to change the "Kind" label associated with files. Many of my files are showing up as "Plain Text File" when they are really javascript, php, css, and other file types. I don't have a ...
7
votes
4answers
557 views

Is there any reason to change the .exe file association on Windows?

A lot of viruses/malware these days hijack the .exe file association on Windows. The default value for an exe file is "%1" %*, which is fine. It launches the exe file with any arguments passed to it. ...
6
votes
1answer
7k views

How to change default app for all files of particular file type through terminal in OS X

How can I change the default app for all files of a particular file type through the Terminal in OS X?
6
votes
1answer
14k views

Where is the Default Program associations stored in the registry?

If I run the assoc command-line utility for an extension, it shows the file type/description for the extension I set in the registry. But if I go to Control Panel -> Default Programs - Set ...
6
votes
1answer
836 views

Is there a tool for managing file extensions and their respective program command lines?

I'm trying to associate .appx files with a utility I wrote which needs a command line similar to appinstaller --install-only --force path\to\appxfile.appx. It also must run as an administrator I ...
6
votes
1answer
973 views

Can Notepad++ be made to open file links in itself?

In Settings/Preferences, Notepad++ has an option on the MISC. tab under 'Clickable Link Settings' to the right, to Enable to open links found in the edited files. It underlines them and opens them on ...
5
votes
3answers
5k views

Set default Ubuntu video player as VLC?

Is there a way to globally set the default video player in Ubuntu 10.04 (and soon 10.10) to VLC? (unless you really think there is another, higher performance player, in which case do let me know)
5
votes
2answers
1k views

Why does Windows default to MS Word to edit .html files?

When trying to edit .html files on Windows XP, they open up in MS Word. Is there any reason that this is the default rather than something that is more lightweight and only deals with plain text and ...
5
votes
5answers
2k views

File association for editing on a mac

I'm quite experienced with how file association works for opening files on Mac OS X. I recall reading somewhere that OS X keeps not only the information about which apps can open a file, but also ...
5
votes
2answers
420 views

Windows file association for README, INSTALL, LICENSE and the like [duplicate]

Possible Duplicate: How to set the default program for opening files without an extension in Windows? Many files originating in the UNIX world come without file extension. Popular examples ...
5
votes
1answer
7k views

How do I fix broken .exe file association in Windows Vista?

Somehow the file association for all .exe files has been deleted on my windows vista machine. For some reason the only thing I can open is Firefox. I think it was the result of a virus. So I have ...
5
votes
3answers
2k views

How do I stop QuickTime from repeatedly stealing file associations?

Every time I update Quicktime on both Vista and XP, I lose file associations I made for VLC (my preferred player). I only keep QT around for the odd browser video, and would prefer to keep it without ...
5
votes
1answer
397 views

How to configure Linux to open files by extension?

The various Linux's desktops open files according to their mime type. This is a very nice feature but I also need to open them by extension (as with Windows). For instance, I want to open every ...
5
votes
1answer
4k views

OSX: assign extension to content kind

Here I have a folder containing a bunch of *.mkv files (video, obviously) and *.srt files (subtitles, obviously). I want to keep them within one folder but I don’t want them to be mixed together. It ...
5
votes
1answer
658 views

How does Linux decide on a default application?

I know that each program that can open files has a desktop entry under /usr/share/applications, and that the defaults for each mimetype are stored in /usr/share/applications/defaults.list and ...
5
votes
1answer
154 views

MM! file in every directory

There's a file called MM! in every directory in DOS 6.22. Just MM!, no file extension... What causes this?
5
votes
2answers
816 views

All files trying to start in Notepad [duplicate]

Possible Duplicate: Window7 troubleshooting .exe is not opening This question has been asked, but the solutions given were worthless to me because ALL files are trying to open in Notepad. I ...
5
votes
3answers
286 views

Inheritance for File Associations under Windows XP?

Is there something like "inheritance" for Windows file associations? I have a file type called rrx that is just a XML file. Now if I open explorer's context menu for a rrx file, I would like it to ...
4
votes
2answers
10k views

How to force a file association in Windows 7? (Regedit?)

I recently upgraded my Adobe CS4 Des. Standard to CS5. For some reason Adobe didn't overwrite CS4 but instead installed CS5 as a whole new series of programs. Seeing as I didn't want both CS4 & ...
4
votes
3answers
491 views

.cmd runs from cmd.exe but not from start menu / Run dialog

problem If I run a .cmd file from cmd.exe it works fine. However if I run it from Start menu / Run line, it opens in Notepad++, my editor. (edit I've it installed for years, didn't update it ...
4
votes
4answers
2k views

Matlab *.mat files associated with MS Office

When Matlab creates a binary file with extension .mat on my Windows 7 (64 bit) computer, Windows declares it in a directory as a „Microsoft Office Access Table Shortcut“. In spite of the fact that ...
4
votes
1answer
2k views

How to change file associations on Mac OS X?

By default PNG images open in Preview. At some point, this has changed on my system so that clicking on a PNG file launches Paintbrush. While that's a really nice app, I'd still like the default to be ...
4
votes
2answers
4k views

How to create a default association for files with no extension [duplicate]

Possible Duplicate: How to set the default program for opening files without an extension in Windows? I am using http://www.pnotepad.org/ (i wouldnt mind switching to something else if it ...
4
votes
2answers
1k views

Windows XP “open with” not allowing a custom option

Up until today I had text files set to open with Notepad++. Today I moved my Notepad++ installation, and after that I am no longer to use "open with" to get a text file open in Notepad++, even though ...