您正在寻找的是 "files.associations" 设置.您可以为每个文件或完整目录指定此设置:

What you are looking for is the "files.associations" setting. You can specify this setting for each file or also for complete directories:

"files.associations": {
    "**/somefolder/*.asp": "html", // add complete folder
    "**/myfileName.asp": "html" // add a specific file 
}