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

empty - DR-DOS executable application file

app - Visual FoxPro application

app - Alphacam punch post file

empty - ArcPad project file

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 file

empty - ThecusOS application file

empty - Atari picture image

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APP file - Psion OVAL data

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 related to the Psion OVAL.

It is a rapid development environment for hand helds - quick, cost-effective programming.

One of the great things about the Psion computers is how easily they can be programmed.

This can be done on the Psion machine itself (using the built-in OPL editor) or by using a PC-based software development kit (SDK), software development environment (SDE) or Psion 'emulator'.

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.

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.

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