A51 file: How can I open a .A51 file?
The table below provides useful information about the .a51 file extension. It answers questions such as:
- What is the .a51 file?
- What program do I need to open a .a51 file?
- How can the .a51 file be opened, edited or printed?
- How can I convert .a51 files to another format?
We hope you find this page helpful and a valuable resource.
✅ µVision Assembler Source Code

The A51 file is a µVision Assembler Source Code. µVision is a window-based software development platform that combines a robust and modern editor with a project manager and make facility tool.
✅ Adobe Authorware 5.1 Library

The A51 file is an Adobe Authorware 5.1 Library. Authorware is a visual authoring tool for creating rich-media e-learning applications for delivery on corporate networks, CD/DVD, and the Web.
⚠ Be careful with .a51 files.
It's important to know that the .a51 file extension can be used by various programs, not just the ones you expect. This includes potentially harmful software or malware that might create .a51 files. Be cautious when dealing with .a51 files from unknown sources.
🚫 The .a51 file extension is often given incorrectly!
According to the searches on our site, these misspellings were the most common in the past year:
Is it possible that the filename extension is misspelled?
We found the following similar file extensions in our database:
🔴 Can't open a .a51 file?
When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:
Select an app to open this .a51 file
It means that the operating system does not have a default app associated with the .a51 file type. To resolve this issue and open the file, you can take the following steps:
- Right-click on the .a51 file. A context menu will appear.
- From the context menu, select Open with. Windows will display a list of recommended apps.
- If the desired app is listed, select it from the provided options.
- If you cannot find the appropriate app, you may need to install software that supports the specific file type.
If you don't know how to change the default app for the .a51 file, check the FAQ.
🔴 Can I change the extension of files?
Changing the filename extension of a file is not a good idea. The extension of a file serves as a hint to the operating system and various software programs about the type of data contained within the file. When you alter a file's extension, you essentially modify how software applications interpret and handle that file. Every file has a specific format, also known as its file type or file format. The problem is, changing the file extension does not change the file format.
If you have helpful information about the .a51 file extension, write to us.