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

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

empty icon.app - Lotus Symphony add-in application

empty icon.app - dBase application generator object

app icon.app - Visual FoxPro application

app icon.app - Alphacam punch post

empty icon.app - ArcPad project file

empty icon.app - Psion OVAL data

empty icon.app - Timex Data Link USB application

empty icon.app - GEM application bundle

empty icon.app - CA Visual Objects platform for developer (CAVO) project

empty icon.app - Clarion for Windows application

empty icon.app - Cybiko computer application file

empty icon.app - Team Developer normal mode application

empty icon.app - OrbWorks PocketC CE application file

empty icon.app - Symbian OS application

empty icon.app - ThecusOS application

empty icon.app - Atari picture image

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APP file extension - DR-DOS executable application

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. The .app file contains application executable.

This app file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

Updated: February 26, 2019

The default software associated to open app file:

DR-DOS icon

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

Company or developer:
DRDOS, Inc.

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 File-Extensions.org's database).

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

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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