.DO File Extension

Java Servlet

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3.5  |  329 Votes

What is a DO file?

A DO file is a web-based Java program (servlet) run by a web server that supports Java, such as Apache Tomcat or IBM WebSphere. It is typically mapped to the Struts controller, which processes the file. DO files are used for generating dynamic webpages, which include data retrieved from databases.

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In the Struts framework, the .do extension is a URL mapping scheme for a web application and not a file extension. For example, Struts often uses the .do string for mapping Java servlet actions to a Struts servlet (typically in the web.xml configuration file).

Additionally, DO files downloaded from a web browser are typically data files, most often .PDF files, such as bank statements or other documents. Some webinar programs may also generate DO files formatted as .VCS files. Changing the file extension to the correct extension (.vcs in this case) may allow you to import the files into programs that support the VCS format.

How to open a DO file

You will likely not encounter a DO file since web servers that support Java, such as Apache Tomcat or IBM WebSphere, handle DO files on the server side.

However, you may download a file via a web browser where the web server mistakenly applies the .do extension. For example, if a web server configuration or media type is incorrect, the server may send you a .do file when you download your bank statement instead of the actual PDF bank statement file. In this case, to open the file, rename the extension to .pdf, then open it with a program that supports PDF files, such as Adobe Reader.

How to convert a DO file

If a web browser erroneously applies the .do extension to a file you have downloaded, you can change the extension to the correct one and then open it with the appropriate app that supports the file type. For example, if the browser applies the .do extension to a .CSV file, you can change the extension to .csv and then open it with an application that supports CSV files.

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Programs that open DO files

Category: Web Files
Updated: September 5, 2023

DOS 3.3 Order Apple II Disk Image

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2.0  |  2 Votes

A DO file may also be a disk image created for use with an Apple II computer. It contains data that was imaged from an Apple II's hard disk, for use as a backup or historical archive. DO files are saved using DOS 3.3 sector order, as opposed to ProDOS sector order.

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Screenshot of a .do file in CiderPress
DO file open in CiderPress

Various tools allow Apple II series users to save the contents of their computers' hard disks as disk images. These images can include applications, files, and other data stored on the computers.

Users can save Apple II disk images in many different formats. Most commonly, Apple II disk images are saved as .DSK files. However, the images may also be saved as DO files or .PO files. DO files store data in DOS 3.3 sector order; PO files store data in ProDOS sector order. (Some Apple II computers used the DOS 3.3 operating systems, while others used ProDOS.)

How to open a DO file

You can open a DO file in several Apple II disk image utilities and Apple II emulators. For example:

  • CiderPress (Windows) allows you to open a DO file to examine, extract, or add to its contents
  • Apple Disk Transfer ProDOS (multiplatform) allows you to transfer DO files to an Apple II computer.
  • KEGS (Kent's Emulated GS) (multiplatform) allows you to open and mount DO files.

How to convert a DO file

CiderPress can convert DO disk images to other disk image formats, including:

  • .PO - ProDOS Order Apple II Disk Image
  • .2MG - Apple IIGS Disk Image
  • NIB - Unadorned Nibble
  • SDK - ShrinkIt Disk Archive
  • APP - TrackStar Disk Image
  • HDV - Sim //e Virtual Hard Drive
  • DDD - DDD Pro Image

Programs that open DO files

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