ATR Types

Leading ATR Type

.ATR

File Name:	.atr
Category:	Atari Disk Image

ATR file extension may refer to a disk image file that is created on the Atari computer system. An Atari 8-bit formatted disk exact copy is stored in this ATR file. It may be a single or double density image that contains 720 or 1440 sectors. Some of the Atari 8-bit computer emulation programs like Xformer, APE, or SIO2PC can be used to mount ATR files on a PC.

Organization:	Atari Corporation
Division:	Disk Image Files
Registry Key:	HKEY_CLASSES_ROOT\.atr

Software Programs That Open The Atari Disk Image:

PC Xformer Classic by Emulators, Inc

Windows

MS-DOS

PC Xformer 2000 by Emulators, Inc

Windows

APE by Steven J Tucker

Windows

SIO2PC by Steven J Tucker

Windows

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ATR File Complications

Frequent ATR Opening Issues

PC Xformer Classic Disappeared

You attempt to load your ATR file and get an error such as "%%os%% Can't Open The ATR File Extension". If so, it typically means that you don't have PC Xformer Classic installed for %%os%%. The OS won't know what to do with your ATR file, so double-clicking to load the file doesn't work.

Tip: Another ATR-related program can be selected to open the file by clicking "Show Apps" and finding the application.

Outdated PC Xformer Classic

It is possible that your version of PC Xformer Classic isn't able to open your Atari Disk Image file due to incompatibility. Installing the latest version of PC Xformer Classic from Emulators, Inc is recommended. This issue mainly occurs when your Atari Disk Image file was created by a newer version of PC Xformer Classic than you have on your PC.

Tip: Sometimes you can get a clue about the version of ATR file you have by right clicking on the file, then clicking on "Properties" (Windows) or "Get Info" (Mac OSX).

Regardless, most of the ATR file opening problems relate to not having the right version of PC Xformer Classic installed.

Associated Difficulties Loading ATR Files

Although you might already have PC Xformer Classic or another ATR-associated software installed on your computer, you can still encounter problems opening Atari Disk Image files. Other ATR opening errors can be created by other system problems inside of %%os%%. Additional factors include:

• ATR file references in the Windows Registry are broken
• Mistaken removal of the Windows registry ATR description
• Partial installation of PC Xformer Classic that did not fully complete
• File corruption affecting your ATR file
• Malware-tainted ATR file can't be opened
• Device drivers for ATR-related hardware are out-of-date
• Your computer does not have the adequate system resources to open the Atari Disk Image format