acgi

.acgiActiveX CGI Script

Microsoft · 1996

Developer
Microsoft
Category
Programming
MIME Type
application/x-acgi
First Released
1996
Open Format
No
File Signature
N/A
At a Glance
.acgi
ActiveX CGI Script

A proprietary server-side scripting interface for older Windows web servers, enabling dynamic content generation via COM-based languages.

Reviewed on June 1, 2026
Compression
N/A
Transparency
No
Editability
High
Best for
Server-side scripting

Key Features

  • Server-side scripting for dynamic web content.
  • Integrates with Windows COM objects and server resources.
  • Supports languages like Visual Basic and C++.
  • Primarily used with Microsoft IIS web server.

Best For

  • Maintaining legacy web applications on older IIS servers.
  • Situations requiring deep integration with Windows COM components.
  • Server-side scripting on specific Windows-based hosting environments.

Less Ideal For

  • Cross-platform development or non-Windows servers.
  • Modern web application development.
  • Performance-critical applications requiring efficient execution.
  • Environments where open standards are preferred.

Common Use Cases

  • Generating dynamic HTML content based on user requests.
  • Interacting with databases on the server.
  • Performing server-side logic for web applications.
  • Customizing web server responses.

How to Open It

  1. ACGI scripts are not typically opened directly by end-users; they are executed by a web server.
  2. To view or edit the script's source code, you would need a text editor or an Integrated Development Environment (IDE) that supports the scripting language (e.g., Visual Studio for older versions).
  3. Ensure the script is deployed on a compatible web server (like IIS) and configured correctly to be processed.

What is a .acgi file?

ACGI (ActiveX CGI) is a scripting interface used on Windows-based web servers, primarily Microsoft Internet Information Services (IIS). It allows web pages to execute server-side code written in languages compatible with Microsoft's COM (Component Object Model) technology, such as Visual Basic or C++. This enables dynamic content generation and interaction with server resources. However, it has largely been superseded by more modern technologies like ASP.NET, making it a less common choice for new web development projects.

Programs That Open .acgi Files

PlatformProgram
WindowsMicrosoft Internet Information Services (IIS)FreeOfficial
Visual Studio (older versions)PaidOfficial

Common Problems with .acgi Files

⚠️ Script execution errors due to COM component issues or incorrect server configuration.
Check server logs for detailed error messages, ensure COM components are registered correctly, and verify IIS configuration for ACGI handlers.
⚠️ Compatibility issues with modern operating systems or web servers.
Consider migrating the application to a more modern framework like ASP.NET or use compatibility settings if available, though full migration is often recommended.

Frequently Asked Questions

Is ACGI still widely used?

No, ACGI is considered a legacy technology and has been largely replaced by ASP.NET and other modern web development frameworks.

Can ACGI scripts be run on Linux servers?

No, ACGI is a Microsoft-specific technology that relies on Windows COM components and is not compatible with Linux or other non-Windows server environments.

What is the difference between CGI and ACGI?

CGI (Common Gateway Interface) is a standard protocol for web servers to execute scripts, while ACGI (ActiveX CGI) is Microsoft's proprietary extension that leverages ActiveX and COM technology for server-side execution on Windows.

Technical Details

ACGI scripts function as COM objects on the server. When a request for an ACGI script is made, the web server instantiates the COM object, passes request information, and executes the script's methods. The script's output is then returned to the browser. It relies heavily on the Windows environment and COM infrastructure.

Did You Know?

ACGI was an early attempt by Microsoft to provide a more robust and object-oriented way for web servers to interact with server-side code.
The reliance on COM technology made ACGI powerful but also tied it exclusively to the Windows ecosystem.

Security Information

Like any server-side script, ACGI scripts can be vulnerable to security risks if not properly coded. Ensure proper input validation and sanitization to prevent injection attacks. Due to its age and proprietary nature, security best practices might differ from modern standards, and migration to newer, more secure technologies is often advisable.

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