File Extension Database

Open DO File

DO file extension most commonly refers to a Java Servlet file, and is used by supporting web servers to generate dynamic web pages. The DO file extension is also used to denote a 4oD playlist,, and is used by Channel 4's video on demand service which is available online or through selected digital television services. Though much less common, the DO file extension is also used by ModelSim, a field-programmable gate array (FPGA) simulator, and legacy DOS 3.3 disk images.

A Java servlet is a class which extends or enhances the capabilities of the host application server. Typically, parameters will be passed to the servlet in the form of a request, which will then generate a response based on the supplied data. This response will usually be dynamically generated content in HTML or XML format. Java servlets provide similar functionality to other web-based languages such as PHP or ASP.NET in that they can be used to generate web pages and content dynamically based on user input. Java servlets use the DO file extension, and may be found in various web-based applications such as online banking.

Channel 4's video on demand service also uses DO files, though these are used to store playlists containing links to programmes and films which can be streamed and watched either on a PC with the 4oD software, or through a digital television service such as Virgin Media or Tiscali TV. Most DO playlist files are ASX playlists albeit with a different file extension, so renaming the file may allow it to be opened with a wider range of applications.

Java servlet files with the DO extension can be opened and run on a web server with support for JavaServer Pages (File extension JSP). Using the associated web application via a standard web browser such as Microsoft Internet Explorer or Mozilla FireFox will then utilise the servlet and its output displayed.

How Can I Open DO File on Windows

We researched and learned that the best way to open DO file is to find a DO file in question in Windows OS File Explorer and double click on it to launch the corresponding application.
If a DO file is not opened in an application and you instead get a "Windows can't open a file" error message you should try looking for an application which can open the file in question.
If you know the application which can open DO file then run it and see if there is a File->Open main menu option in the application.
If you don't know the application which function as DO file opener then try to search online for "DO viewer", "application to open DO file" or "open DO file" queries in the search engine you like.
Install the application you found and check if it can open DO file

How Can I Open DO File on Mac OS

We recommend to find a DO file in question in Mac OS Finder and double click on it to launch the corresponding application.
If a DO file is not opened in a Mac OS application and you instead get a "There is no application set to open the file" error message you can click on "Search App Store" in the error dialog and Mac OS will show you applications compatible with DO file.
If you know the Mac OS application which can work as DO file opener you can choose the "Choose Application..." option in the error box to associate the file extension and open DO file in it.
If you don't know the application which can open DO file then try to search for "DO viewer", "application to open DO file" or "read DO file" queries in the online search engine you like.
Install the application you found and check if it can read DO file

How Can I Open DO File on Android

If you downloaded a DO file on Android device you can open it by following steps below:

In the Android apps list on your Android device find "My Files" or "File manager" app and tap to start it.
Tap on "Downloads" folder inside the app.
You should see your downloaded DO file in that folder.
Tap on the file. If Android device supports opening the file you downloaded it will open in the corresponding app.
If file does not open you can look for the corresponding app that can open the file by searching Android App Store for the "DO".
If you cannot open the file with the apps from Android App Store it is possible that the file could only be opened on desktop platforms such as Windows or Mac OS. Try searching for "DO viewer", "DO file reader" online and see if any desktop applications can open it.
It is also possible that the file you downloaded is outdated and is no longer supported.

How to Open DO File on iPhone or iPad

To open DO File on iOS device follow steps below:

We advies to open Files app on your iPhone or iPad device. You can find it by swiping down on the home screen and typing "Files" in the search bar.
Tap on the Downloads folder on the Files app home screen.
You will see all files that you recently downloaded. Tap on the DO file to view it.
If you have the right app that can open it it will automatically launch and open your file.
If you don't have the app which can open it you need to serch Apple app store for "DO". This way you can find apps which can open DO files.
If this doesn't help it is possible that your file could be opened only by the desktop application. To find an app which can open it on desktop look for "DO viewer" or "DO file" online in your favorite search engine.