Opening .ASP files can seem challenging if you're unfamiliar with web development tools. Saffron Tech, a leader in web solutions, provides a straightforward guide on accessing and working with .ASP files, commonly used in web applications built on Active Server Pages (ASP).
If your goal is to test an .ASP file’s functionality, simply opening it in a browser won’t execute the code, as .ASP files require a server environment like IIS (Internet Information Services). Setting up a local server allows the file to run, so you can see the dynamic web pages as intended.
https://www.saffrontech.net/blog/opening-asp-file