How will I know what program/Application is associated with a given file extension?

General question: How can I determine what Application is using a certain file extension? Some are well known, such as .doc for MS Word, MS Excel .xls, PDF for Adobe Acrobat. But is there a master list somewhere which is viewable by the general public?
This question came from what I was gettnig low disk space on my hard drive and do some research, and found a group of 5 files with extension. ECW, for a total of almost 50 MB. After trying for a few hours to find on the Web, what type of program may have created these files, I let fall, back up the files on a CD and has deleted and restarted. So far, no bad consequences, but still a little scary.
I think that all software manufacturers should have to register their extensions with MicroSoft, correct? To repeat: is there a list published, or how to find this information in the future?

Alphabetical list of file extensions

Scroll to the end, click on the alphabet to find the extension and program to open with.
e.g. p for pps etc.


Tags: Windows

Similar Questions

  • How will I know what program opens svchost

    My system is slow. I did tests antivirus, cleaned the registry and cannot speed it up. I also, like many, that multiple instances of svchost.exe running process. One of them is systematically use the 225 000 Ko. is it possible to tell what program or application started this?


    Read this information about it

    What is svchost.exe and why it works?

    and also malware scanner

    Download update and scan with the free version of malwarebytes anti-malware

    You can also download and run rkill to stop the process of problem before you download and scan with malwarebytes

    If it does not remove the problem and or work correctly in normal mode do work above in safe mode with networking

    Windows Vista

    Using the F8 method:

    1. Restart your computer.
    2. When the computer starts, you will see your computer hardware are listed. When you see this information begins to tap theF8 key repeatedly until you are presented with theBoot Options Advanced Windows Vista.
    3. Select the Safe Mode with networking with the arrow keys.
    4. Then press enter on your keyboard to start mode without failure of Vista.
    5. To start Windows, you'll be a typical logon screen. Connect to your computer and Vista goes into safe mode.
    6. Do whatever tasks you need and when you are done, reboot to return to normal mode.
  • How will I know if a host is associated with a vCenter Server

    Once my 5.0 ESXi host is managed by / code with a vCenter server, there are some commands that you can perform only through the vCenter.

    In particular, all-hard drive size, whole-controller SCSI and Set-VMReservations.

    In case my vCenter is down, I would leave my script (PowerCLI 5.5r1) with a mistake that these operations cannot be executed until start of vCenter or the host that contains the virtual machine is no longer active with vCenter.  I think it's safe to let the user decide how he wants to move forward in this case and not build it in my script.

    Is there a cmdlet to ask the host if it is associated with a vCenter Server?  When you use VI Client to connect to the host, you can see the link in the lower right part of the Summary tab that says "separate host to vCenter Server...". ».

    The get-VMHost cmdlet seems like it should have this info, but I was not able to find.

    Thanks for your suggestions


    Please take a look to determine vCenter management host to see if that helps.


  • UCS Plugin - How will I know if a blade is associated with related?

    I use the Plugin UCS to associate a Service profile with a blade. When I do, the function call returns immediately. But I want to wait that the blade be associated before proceeding. How to figure out when the blade is made combining? The UcsmBlade.status parameter is not good, it returns without return Null.

    A detailed example of a use case is described on the blog of vCO:

    Step 3, 4 and 5 of this use case are:

    3 assign the Service profile to a blade

    4. wait for the association must be true (the blade is going to be started)

    5 do something else after that depending on the result (for example, send a notification to someone)

    This should provide you with the information required to complete your use case.

    Thank you


  • How will I know what patch to install for my OS?

    How will I know what patch to install? It is said that incorrect can harm my system, but there are three options and no indicator of which is necessary for my specific problem.

    Thank you


    you mean x 86, x 64 or ia64?

    If you use a 32-bit Windows, version asks the x 86. If you use a x 64 64-bit Windows application version.

    "A programmer is just a tool that converts the caffeine in code" Deputy CLIP -

  • How do I know what programs are safe stop execution or remove it from the startup of Windows 7?

    How do I know what programs are safe stop execution or remove it from the startup of Windows 7?

    original title: start up programs?


    You can use these to control which startup programs. Many others settle
    start-up haven't really needed to be there. Such as Acrobat Reader (Adobe), WinAmp
    Agent and many others who are responsible for pieces of themselves to get started more quickly (not a problem
    on the machines of today ' hui) and of course they can control the files they support (to be
    course you continue to use only). Those who are only common examples and didn't want to not say
    as a slam on these programs very well.

    How to troubleshoot a problem by performing a clean boot in Windows Vista or Windows 7

    How to change, add or remove startup programs in Windows 7

    Autoruns - free - see what programs are configured so that it starts automatically when your
    system boots and you log in. Autoruns is also the full list of registry and files
    locations where applications can configure start automatic settings.


    Performance and maintenance tips

    I hope this helps.

    Rob Brown - Microsoft MVP<- profile="" -="" windows="" expert="" -="" consumer="" :="" bicycle=""><- mark="" twain="" said="" it="">

  • IPhone 6 - How will I know what apps are underway in the background?

    IPhone 6 - How will I know what apps are underway in the background?

    On multitasking on your iPhone, iPad and iPod touch - Apple Support

    Scroll to the bottom where he treats background App update!

    You can visit these settings under settings > general > background App update.

  • I have a 2002 Home edition WIndows Xp System. How will I know what bit is?

    How will I know what bit is?

    Because they do not have a 64-bit edition family... you have a 32-bit operating system.

    To see for yourself, make a right click workstation-> properties, on the general tab, you will see under "system":
    Microsoft Windows XP
    Home Edition
    Version 2002
    Service Pack 3

    For a 64-bit version "Windows XP Professional x 64 Edition" appears under System.

  • How will I know what is the speed of the internet to my computer?

    How will I know what is the speed of the internet to my computer. IM using wifi and tries to install steem, so I can play a game and want to know if I have a) modem - 56 k, b) dsl > 256 k, c) > 756 k, d dsl) dsl/cable > 2 m or e) cable/Fiber > 10 m

    go to and run the test here.  It will show you your true speed.

  • How will I know what camera raw I like a plug-in?  I started using PSCC.

    How will I know what camera raw I like a plug-in?  I started using PS cc.

    In Photoshop:

    Click on Photoshop (Mac) or (Win) the help > about Plug-Ins > Camera Raw

  • How will I know what color space is assigned?

    How will I know what color space has been assigned to an image imported into lightroom.  I think that sRGB is affected when it was edited in Photoshop and saved in TIFF format, but how can I check that in Lightroom?

    Blue II Baron wrote:

    I have LR5.3 on a Windows 7 computer.  Bob, I do not see the options that only show you in my list of smart collection.

    Here's what I do to create a smart collection Group (name correctly):

  • How will I know if my games is compatible with Windows 7?

    How will I know if my games is compatible with Windows 7?

    You can check the compatibility of software and hardware on the way to the Windows 7 Compatibility Center. You can also get information on thousands of software and devices and receive feedback from users. Visit the compatibility to Center

  • my C drive is full, how do I know what programs can I remove?

    I know that you can remove some programs, but how do I know what ones I can remove without affecting my computer?

    I know that you can remove some programs, but how do I know what ones I can remove without affecting my computer?

    We cannot comment on what programs you need to remove. In addition, some programs running in the background and removing will raise questions.

    However, you can uninstall programs that have been installed by you. You can go to start-> programs and features-> press enter type. Search for programs that have been installed by you, select them and click on uninstall, individually.
    Once uninstalled, you can install another drive as the installation location.
    But, before you uninstall, go on-> do work right click on the C partition :\-> click Properties. In the Properties dialog box, click Disk Cleanup. In the Disk Cleanup dialog box, click clean up system files. And then click Ok. This will clean the junk files.
  • need help on history, recycle bin and cookies: how will I know what someone has done on my laptop?

    I would like to learn more about history on my computer vista laptop microsoft and more on maybe the trash and or cookies. For example, someone else used my laptop last night and delete everything that he was looking at or for then how can I know what it was?

    Assuming that it has not been removed, you can view the history of visited web sites by clicking on the Favorites button, click the history tab.

    The only things in the trash are files or folders that have been removed from the system (no evidence they have been read or something like that).

    Cookies will not tell you anything either because they are terms in the code and you can not tell what web site they belong - no good for tracking not web history (and they apply only to the history of the web).

    You can view the Start / recent items to display some of the files which were recently seen (assuming that the list has not been removed).  That may help some.  You can also go to C:\Users\\Recent for a longer list of recently accessed files (as long as you know the user name).

    There is actually very little that you can do with hindsight to see what anyone seen or done on your computer.

    If you want to implement such a procedure, use the Parental control and activity reports control Parental  Do this for each account you want to track.  Then you can check what you wish now that you could check.

    I hope this helps.

    Good luck!

    Lorien - MCSA/MCSE/network + / has + - if this post solves your problem, please click the 'Mark as answer' or 'Useful' button at the top of this message. Marking a post as answer, or relatively useful, you help others find the answer more quickly.

  • How will I know what security pack I have in my computer? and do I have to load the update of security in ms10-046

    I have recivied an email indicating that I need to load a security update. He referenced MS10-046 "a vulnerability in the windows shell could allow remote access" is this necessary? and it refers to the sp2. Which leads to my next question how can I know what "SP" I have on my computer. Thanks for your time and considerartion.

    go to start > run > type


    Click ok

    What service pack t - he say that contains?

Maybe you are looking for

  • When Vista starts, system crashes. No access to F2 or F12

    1. turn on the system 2. first screen displays F2 and F12 to get into the BIOS. 3 Startup proceeds but stop with the following Message stressed: "Delete restoration data and proceed to System Boot Menu" or Message to not highlight: "continue the syst

  • whenever I try to download the updates, I get the error 0x80072efe code.

    What should I do to get rid of this message, so I can download updates? I tried everything I can't think. Help, please.

  • How the computer name of the domain?

    I want to know how to create the domain of computer name in the unattendant.xml file.

  • Use of the RAM mounted fast

    I noticed that my computer suffered a ridiculous amount of lag and saw that my memory usage was close to 98%. I cut all my open programs, other than the Task Manager, and only, it dropped to 80%. (is usually around 40-50% usage) With each program clo

  • Install the driver network problem

    Hello Recently replaced the hard drive in my laptop, forcing me to reinstall Windows Vista Basic. The laptop is a HP Compaq CQ60-310EO. Installation went well, now trying to download the drivers for the network card on another computer and install it