A daily updated filename extension database!

A1 file - How do I open a .a1 file?

The table below provides useful information about the .a1 file extension. It answers questions such as:

We hope you find this page helpful and a valuable resource!

1 extension(s) and 1 alias(es) found in database

✅ Free Pascal Compiled Archive

Free Pascal Compiled Archive .a1 file icon
The A1 file is a Free Pascal Compiled Archive. Free Pascal is a free, portable, open source, Pascal and Object Pascal compiler.
The A1 format description is not yet available
Category: Development files
Application: Free Pascal
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
A1 aliases:
A1 related links:
A1 related extensions:
FreePascal Compiled Unit

FreePascal GO321v1 Compiled Unit

FreePascal Object

FreePascal Compiler Makefile

Free Pascal Compiled Unit

Free Pascal Assembler Data

✅ OpenEdge ABL After Image

OpenEdge ABL After Image .ai file icon
The AI file is an OpenEdge ABL After Image. OpenEdge Advanced Business Language is a business application development language created and maintained by Progress Software Corporation (PSC).
The AI format description is not yet available
Category: Development files
Application: Progress OpenEdge
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
AI aliases:
a1, a2
AI related links:
AI related extensions:
Hypertext Markup Language Document

Extensible Markup Language File

Web Services Description Language Document

OpenEdge Web Services Application Descriptor

Visual Studio .NET Dynamic Discovery Data

Visual Studio .NET Web Information Data

Other types of files may also use the .a1 file extension.

🚫 The .a1 file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

al, aq, aw, q1, x1, z1

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

WinAMP Equalizer Presets
X1 Saved Search
Z-machine Z-code File
Autodesk Simulation Mechanical Statistics Summary Data
Ancestral Quest Database
Answer Wizard Index

🔴 Can't open a .a1 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:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .a1 file association, check the FAQ.

🔴 Can I change the extension of 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 the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .a1 file extension, write to us!

Browser: Abbreviation Application Archive Audio Configuration Data Development Disk Image Document Ebook Font Game Data GIS Graphic Malware Multimedia Other Project Scam Unknown Video
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