A66 File Extension

What is A66 file?

A66 filename suffix is mostly used for µVision Assembler Source files. µVision Assembler Source format was developed by ARM Holdings plc. Files with A66 extension may be used by programs distributed for Windows platform. A66 file belongs to the Developer Files category just like 1205 other filename extensions listed in our database. is by far the most used program for working with A66 files.

Programs which support A66 file extension

The following listing features A66-compatible programs. Files with A66 extension, just like any other file formats, can be found on any operating system. The files in question may be transferred to other devices, be it mobile or stationary, yet not all systems may be capable of properly handling such files.

How to open file with A66 extension?

Problems with accessing A66 may be due to various reasons. Fortunately, most common problems with A66 files can be solved without in-depth IT knowledge, and most importantly, in a matter of minutes. The list below will guide you through the process of addressing the encountered problem.

Step 1. Install software

The main and most frequent cause precluding users form opening A66 files is that no program that can handle A66 files is installed on user’s system. The solution to this problem is very simple. Download and install it on your device. Above you will find a complete listing of programs that support A66 files, classified according to system platforms for which they are available. The safest method of downloading installed is by going to developer’s website () and downloading the software using provided links.

Step 2. Check the version of and update if needed

If you already have installed on your systems and A66 files are still not opened properly, check if you have the latest version of the software. Sometimes software developers introduce new formats in place of that already supports along with newer versions of their applications. The reason that cannot handle files with A66 may be that the software is outdated. The most recent version of is backward compatible and can handle file formats supported by older versions of the software.

Step 3. Associate µVision Assembler Source files with

If you have the latest version of installed and the problem persists, select it as the default program to be used to manage A66 on your device. The method is quite simple and varies little across operating systems.

The procedure to change the default program in Windows

• Choose the Open with entry from the file menu accessed by right-mouse clicking on the A66 file
• Select Choose another app → More apps
• The last step is to select Look for another app on this PC option supply the directory path to the folder where is installed. Now all that is left is to confirm your choice by selecting Always use this app to open A66 files and clicking OK.

The procedure to change the default program in Mac OS

• By clicking right mouse button on the selected A66 file open the file menu and choose Information
• Proceed to the Open with section. If its closed, click the title to access available options
• Select and click Change for all...
• Finally, a This change will be applied to all files with A66 extension message should pop-up. Click Continue button in order to confirm your choice.

Step 4. Ensure that the A66 file is complete and free of errors

Should the problem still occur after following steps 1-3, check if the A66 file is valid. Problems with opening the file may arise due to various reasons.

1. Verify that the A66 in question is not infected with a computer virus

If the file is infected, the malware that resides in the A66 file hinders attempts to open it. Scan the A66 file as well as your computer for malware or viruses. If the scanner detected that the A66 file is unsafe, proceed as instructed by the antivirus program to neutralize the threat.

2. Ensure the file with A66 extension is complete and error-free

If the A66 file was sent to you by someone else, ask this person to resend the file to you. During the copy process of the file errors may occurred rendering the file incomplete or corrupted. This could be the source of encountered problems with the file. When downloading the file with A66 extension from the internet an error may occurred resulting in incomplete file. Try downloading the file again.

3. Verify whether your account has administrative rights

Sometimes in order to access files user need to have administrative privileges. Log out of your current account and log in to an account with sufficient access privileges. Then open the µVision Assembler Source file.

4. Check whether your system can handle

If the system is under havy load, it may not be able to handle the program that you use to open files with A66 extension. In this case close the other applications.

5. Check if you have the latest updates to the operating system and drivers

Latest versions of programs and drivers may help you solve problems with µVision Assembler Source files and ensure security of your device and operating system. It is possible that one of the available system or driver updates may solve the problems with A66 files affecting older versions of given software.

Do you want to help?

If you have additional information about the A66 file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on A66 file.