diff --git a/lldb/tools/lldb-vscode/lldb-vscode.cpp b/lldb/tools/lldb-vscode/lldb-vscode.cpp
--- a/lldb/tools/lldb-vscode/lldb-vscode.cpp
+++ b/lldb/tools/lldb-vscode/lldb-vscode.cpp
@@ -2188,6 +2188,7 @@
   } else {
     response["success"] = llvm::json::Value(false);
   }
+  EmplaceSafeString(body, "mimeType", "text/x-lldb.disassembly");
   response.try_emplace("body", std::move(body));
   g_vsc.SendJSON(llvm::json::Value(std::move(response)));
 }
diff --git a/llvm/utils/vscode/llvm/package.json b/llvm/utils/vscode/llvm/package.json
--- a/llvm/utils/vscode/llvm/package.json
+++ b/llvm/utils/vscode/llvm/package.json
@@ -39,6 +39,15 @@
                     ".ll"
                 ],
                 "configuration": "./language-configuration.json"
+            },
+            {
+                "id": "lldb.disassembly",
+                "aliases": [
+                "Disassembly"
+                ],
+                "extensions": [
+                ".disasm"
+                ]
             }
         ],
         "grammars": [
@@ -51,6 +60,11 @@
                 "language": "llvm",
                 "scopeName": "source.llvm",
                 "path": "./syntaxes/ll.tmLanguage.json"
+            },
+            {
+                "language": "lldb.disassembly",
+                "scopeName": "source.disassembly",
+                "path": "./syntaxes/disassembly.json"
             }
         ],
         "taskDefinitions": [
diff --git a/llvm/utils/vscode/llvm/syntaxes/disassembly.json b/llvm/utils/vscode/llvm/syntaxes/disassembly.json
new file mode 100644
--- /dev/null
+++ b/llvm/utils/vscode/llvm/syntaxes/disassembly.json
@@ -0,0 +1,31 @@
+{
+  "name": "Disassembly",
+  "scopeName": "source.disassembly",
+  "uuid": "9ade615f-5d82-4ac5-b22f-a1998c356ebe",
+  "patterns": [
+    {
+      "comment": "Address, bytes and opcode",
+      "name": "meta.instruction",
+      "match": "^([A-Za-z0-9]+):\\s([A-Z0-9]{2}\\s)+>?\\s+(\\w+)",
+      "captures": {
+        "1": {"name": "constant.numeric"},
+        "3": {"name": "keyword.opcode"}
+      }
+    },
+    {
+      "comment": "Numeric constant",
+      "name": "constant.numeric",
+      "match": "(\\$|\\b)((0x)|[0-9])[A-Za-z0-9]+\\b"
+    },
+    {
+      "comment": "Register",
+      "name": "variable.language",
+      "match": "%[A-Za-z][A-Za-z0-9]*"
+    },
+    {
+      "comment": "End of line comment",
+      "name": "comment.line.semicolon",
+      "match": ";.*$"
+    }
+  ]
+}