An apa file extension is related to the ArcPad and used for its applet files.
There are 2 other file types using
the APA file extension!
.apa - RSView Application Manager project archive
.apa - AlfaPad Notes Organizer document
Detailed description
Software that open apa file
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What is apa file? How to open apa files?
The apa file extension is associated with the ArcPad, a mobile GIS software for field mapping applications, developed by ESRI company.
The apa file contains applet created with ArcPad program.
The default software associated to open apa file:
ArcPad 
Company or developer:
Esri
ArcPad is GIS software for Windows Mobile operating system. ArcPad provides field-based personnel with the ability to capture, analyze, and display geographic information.
Help how to open:
Use ArcPad to work with *.apa files.
How to convert:
As far as we know, this .apa 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 software applications associated to the .apa 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 apa file, edit apa file, convert apa file, view apa file, play apa file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting apa files.
Software that open apa file - ArcPad applet
Programs supporting the exension apa on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about ArcPad for open apa file action.
Programs that can create apa file - ArcPad applet
Programs supporting the exension apa on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about ArcPad for create apa file action.
Unspecified and all other actions for computer programs working with apa file - ArcPad applet
Click on the software link for more information about ArcPad. ArcPad uses apa 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.).
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