There are 17 other file types using
the APP file extension!

app - Mac application package or core system service [common]

empty - Lotus Symphony add-in application file

empty - dBase application generator object

app - Visual FoxPro application

app - Alphacam punch post file

empty - ArcPad project file

empty - Psion OVAL data

empty - Timex Data Link USB application file

empty - GEM application bundle

empty - CA Visual Objects platform for developer (CAVO) project file

empty - Clarion for Windows application

empty - Cybiko computer application file

empty - Team Developer normal mode application file

empty - OrbWorks PocketC CE application file

empty - Symbian OS application

empty - ThecusOS application

empty - Atari picture image

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APP file extension - DR-DOS executable application file

What is app file? How to open app files?

File type specification:

Program executable file type icon Program executable file type

The APP file extension is associated with DR-DOS, once a popular PC operating system that was originally created and developed up to version 6.0 by Digital Research.

After the demise of Digital Research, it was acquired by Novell who released version 7.0 as Novell DOS 7. Despite being a commercial success, Novell lost their interest in the further development of DR-DOS and in 1996 sold it to Caldera, who changed the name to Caldera OpenDOS 7.01 and released the source code of the kernel under an Open Source license. Subsequent versions were named DR-DOS again, but unfortunately, the development model was changed back to Closed Source. Caldera Thinclients, a subsidiary of Caldera which later renamed itself to Lineo, continued the development of DR-DOS as an OS for embedded systems, before they abandoned its development in favour of Linux. The current owners of DR-DOS, Devicelogics, acquired it in November 2002 and promised to produce an 8.0 version of DR-DOS for the embedded systems market, which was released in March 2004.

In July 2002, when the commercial development of DR-DOS was stagnating and the last official version had been released three years ago, I decided to continue the development of DR-DOS as an Open Source operating system. Since the source code of later versions was not freely available, I used the source code of DR-DOS 7.01 alias OpenDOS as a base for my work and started to write my own set of patches for it. Thus, The DR-DOS/OpenDOS Enhancement Project was born! Like the name states, the aim of this project is to enhance the capabilities of DR-DOS/OpenDOS 7.0x and to add support for new standards. In the course of the first two years, the project reached many of its short-term design goals, including native support for large disks (LBA) and the FAT32 file system, and it became a bigger success than I had ever hoped, last but not least thanks to the support from the DR-DOS community!

Like other, similar projects, it strives to achieve compatibility with most existing software written for DOS. Unlike these, however, it will not stop there. The long-term goal will be to gradually evolve DR-DOS into a modern PC operating system with all features that one would expect of one of these, but hopefully without the weaknesses of other existing next-generation PC operating systems. How long it will take to achieve this goal remains to be seen, but I am confident that it will become reality.

The default software associated to open app file:

DR-DOS icon

DRDOS, Inc. logoDR-DOS  Microsoft MS-DOS software

Company or developer:

A desktop OS solution, DR-DOS is the ideal embedded DOS system, designed for straight forward out-of-the-box implementation into ROM or Flash ROM. DRDOS makes these tools and associated documents available in the DRDOS OEM Kit.

Help how to open:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert:

As far as we know, this .app file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

List of recommended software applications associated to the .app file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open app file, edit app file, convert app file, view app file, play app file etc. (if exist software for corresponding action in's database).

Unspecified and all other actions for computer programs working with app file - DR-DOS executable application file

Click on the software link for more information about DR-DOS. DR-DOS uses app file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).

Microsoft MS-DOS:

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