All about A78 Files

The A78 file type is primarily associated with Atari.

A78	File extension: A78
	File type:	7800 ROM Image

What is an A78 file?

A78 files mostly belong to Atari by Atari. Use our "Online A78 Text Viewer" below to analyze your A78 file and to see all text it contains.

How to open an A78 file

You need a suitable software like Atari to open an A78 file. You need a suitable software like Atari from Atari to open an A78 file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your A78 file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a A78 file directly in the browser:. Just drag the file onto this browser window and drop it.

Online A78 Text Viewer

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What to Do When a .A78 File Fails to Open

Because .A78 files can originate from different sources, they aren't universally openable by standard applications.

Identify the Source: If downloaded from a retro gaming site, it's likely an Atari 7800 ROM Image. If received from a developer, it may be a homebrew game.
Check the Header: Open the file in a hex viewer to inspect its first bytes.
- "ATARI7800" text confirms it's an Atari emulator ROM.
- "PK" indicates a ZIP archive containing the ROM.
- Unreadable binary suggests a raw game dump.
Use the Original Software: The original emulator is usually required; try ProSystem, EMU7800, or MAME. If uncertain, ask the sender.
Use this Webpage: Drag and drop your .A78 file here to detect its format, extract metadata, and preview contents.

Technical Data for A78 File Extension

File classification:

Game

Identifier:

Hex: 01 41 54 41 52 49 37 38 30 30, ASCII: ATARI7800 (provided by TrID database)

Related files:

zip, ttp, mbk, di

an a78 7800 ROM Image is a special file format by Atari and should only be edited and saved with the appropriate software.

How to solve problems with A78 files

Associate the A78 file extension with the correct application.
Update your software that should actually open 7800 rom images. Because only the current version supports the latest A78 file format. Search, therefore, e.g. on the Atari manufacturer website after an available Atari update.
To make sure that your A78 file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .A78 file online - secure, fast, and no downloads needed.