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Basic information about A78 file

When there is a problem with opening files with the file extension A78（*.A78 or *.a78）, you do not need a computer expert. In most cases, using the helpful suggestions of experts contained in our website as well as appropriate programs, you can solve the problem with the A78 file yourself.

There are 1 file types using the A78 file extension in our database. In the further part of this page, you will find detail information about all the A78 file with their brief description and a list of programs that support A78 file sorted by operating systems. The table below provides useful information about the A78 file extension. It answers questions such as:
  • What is the A78 file?
  • How to open a A78 file?
  • What programs do I need to open a A78 file?
  • What programs help to create and edit a A78 file?
  • How to convert A78 files to another file format?
  • How to convert another files to A78 file format?


1.Detail information about A78 file extension: Atari 7800 ROM

File type Atari 7800 ROM Category Game Files
Developer N/A File format Binary
Description A78 file is a Atari 7800 ROM. An A78 file is a game ROM file used by Atari 7800 emulators, which can play Atari 7800 games as if they were run on the original system. It contains an exact copy of game data from the original game cartridge, which is used by an emulator to play the game.
Software programs that will open, edit or convert A78 files

Windows		 MESS
Emu7800
ProSystem Emulator

macOS		 OpenEmu



Can't open a A78 file?

When you click a file to open it, operating system examines the filename extension. If operating system recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When operating system does not recognize a filename extension, you receive the following message:

”Can't open this file: example.A78”。

To open this file, you install one of the applications from the list of software programs that you found here, you should be able to open, edit or convert the file with the A78 extension without any issue.


Where I can download the application that support A78 file?

If you do not know where you can download the application from our list, click on the link (which is the name of the program), you will find more information there on the location where to download the required application. Most often they are the websites of software manufacturers.


How to change file associations?

  • Right-click a file with the extension whose association you want to change, and then click "Open With".
  • In the "Open With" dialog box, click the program whith which you want the file to open, or click "Browse" to locate the program that you want.
  • Select the ”Always use the selected program to open this kind of file” check box.


Can I change the extension of A78 files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read/open the file. The problem is, changing the file extension does not change the file format. Select a software program from our list and install it on your computer. If the file has not opened correctly, you have to look for a different software program from our list. Sometimes you have to repeat the operation several times.


What else may cause problems width open a A78 file?

The reasons for the lack of the ability to open a A78 file on your computer may be at least several. The easiest thing is to find a suitable application installed on your computer, which will open a A78 file. If there is still something wrong, you might want to check:

  • Whether the A78 file is damaged.
  • Whether the A78 file is incorrectly linked in the registry entries.
  • Whether the A78 file extension has been accidentally removed from the Windows registry.
  • Whether the installation of an application that supports the A78 file format is incompletely.
  • Whether the A78 file is infected.
  • Whether the drivers of the equipment used for opening a A78 file are up to date.
  • Whether your computer has enough hardware resources to open a A78 file.

If the A78 file still not working with your software after eliminating the above shortcomings? That means that the problem is more complex and requires the help of a specialist.