The SITEMAP files locate in the root directory. It names Web.sitemap. The formatting saves using XML. File format online tools and apps open with associated software programs. Know .sitemap file type with issues.
ASP.NET Site Map Format develops originally for Microsoft Visual Studio application. Generated by the Microsoft Visual Studio program likely this particular file format. Choose right tool – file opener, converter, viewer or editor.
If system under heavy load, it may not handle program you use to open files with SITEMAP extension well. Close other applications in this case. Install latest drivers and system updates and patches. Latest software versions and drivers may help solve problems with ASP.NET Site Map Format files. Also ensure device and operating system security.
XML site map files do not have to end with the .xml file extension. The Sitemap Protocol site does not cover this. Sitemaps with .php extensions seen as well. The SITEMAP file extension can find in other 303 file types too. May not support by Microsoft Visual Studio or similar programs.
Use simplest text file format to create a sitemap for sites with few pages. Txt extension file type the easiest text file format. Easily create a text sitemap with Notepad and other text editors simply. Follow general guidelines if you want to create own.
Google Search Console
XML Sitemap Generator