There are 10 other file types using
the ASP file extension!
.asp - ASP text document
.asp - Astound presentation
.asp - Adobe Photoshop photo file index
.asp - Procomm Plus ASPect language script
.asp - Alphacam stone post data
.asp - Adobe Photoshop separation setup
.asp - Adobe Acrobat data
.asp - ASAP WebShow presentation
.asp - Canvas separation setup
.asp - MSN ASF video plugin
ASP file extension - Active Server Page script page
What is asp file? How to open asp files?
File type specification:
Source code and script file type
Email attachment blocked file type
asp file icon: 
The asp file extension is associated with Microsoft Active Server Page source code script file.
The asp files are used to create dynamically generated websites and other webpage content.
The ASP code is inserted into static HTML pages with <%%> tags by default, although these tags can be changed to anything you would like. So, like, if you were a PHP programmer forced by his workplace to use ASP, you could change those percentage signs to question marks.
The ASP is Microsoft's proprietary answer to PHP server side scripting language or Cold Fusion. The new version of ASP and not backward compatible is ASP.NET (aspx file extension).
Technically, ASP is not a scripting language; it's an open standard object model for web services, or something along those lines. So, although the vast majority of ASP pages are written in Microsoft's VisualBasic, they can actually be written in any language for which an ASP thingy has been written. Presently, this means you could also write ASP pages in JavaScript or PerlScript, and maybe one or two others I haven't heard of. The defining characteristic that makes it ASP is the way that you access the 'Write' method of the 'Server' object in order to output "Hello World!".
Microsoft has added a lot of extensions to ASP that are very difficult to find information on in a Google search because they are the same as top-level domains, like COM and .NET. As far as I understand it, COM added the ability to write some code for your ASP pages in a separate file, compile it to assembly, and register it as a service with the operating system. You just have to make your code in the form of an object, which you instantiate from within your scripts to use it. Thus, you can write code for the web in C++ or whatever, and get really fast speeds.
Since the ASP pages are processed on the server, website visitors do not see the actual ASP code, just the common HTML pages generated from the scripts within the page.
The .asp pages typically use the ASP extension rather than HTML file extension.
Updated: June 6, 2022
The default software associated to open asp file:
Company or developer:
Microsoft Corporation
Microsoft ASP.NET is web application framework used by web programmers to crate web applications, web services and dynamic web sites. Source code of ASP.NET web is written in static (X)HTML and dynamic parts use .NET source code. ASP.NET pages work in all web browsers, such as Firefox, Internet Explorer, Safari, Opera etc.
Company or developer:
Microsoft Corporation
Microsoft Visual Studio is an integrated development environment (IDE) used to create applications for Microsoft Windows, Windows Mobile, .NET Framework, Silverlight as well as dynamic websites and web applications. Visual Studio is available for Windows and Mac.
List of software applications associated to the .asp file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open asp file, edit asp file, convert asp file, view asp file, play asp file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting asp files.
Software that open asp file - Active Server Page script page
Programs supporting the exension asp on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open asp file action.
