diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index b7f54c5f1..28d3c1b32 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -19,9 +19,9 @@ jobs:
       matrix:
         node-version: [14, 16]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v2
+      uses: actions/setup-node@v3
       with:
         node-version: ${{ matrix.node-version }}
     - name: Install Dependencies
diff --git a/packages/node_modules/@node-red/nodes/core/storage/10-file.js b/packages/node_modules/@node-red/nodes/core/storage/10-file.js
index d0db89d01..d3b8a0765 100644
--- a/packages/node_modules/@node-red/nodes/core/storage/10-file.js
+++ b/packages/node_modules/@node-red/nodes/core/storage/10-file.js
@@ -117,7 +117,9 @@ module.exports = function(RED) {
                 }
                 if (typeof data === "boolean") { data = data.toString(); }
                 if (typeof data === "number") { data = data.toString(); }
-                if ((node.appendNewline) && (!Buffer.isBuffer(data))) { data += os.EOL; }
+                var aflg = true;
+                if (msg.hasOwnProperty("parts") && msg.parts.type === "string" && (msg.parts.count === msg.parts.index + 1)) { aflg = false; }
+                if ((node.appendNewline) && (!Buffer.isBuffer(data)) && aflg) { data += os.EOL; }
                 var buf;
                 if (node.encoding === "setbymsg") {
                     buf = encode(data, msg.encoding || "none");
@@ -314,7 +316,6 @@ module.exports = function(RED) {
             });
             filename = filename || "";
             var fullFilename = filename;
-            var filePath = "";
             if (filename && RED.settings.fileWorkingDirectory && !path.isAbsolute(filename)) {
                 fullFilename = path.resolve(path.join(RED.settings.fileWorkingDirectory,filename));
             }
diff --git a/test/nodes/core/storage/10-file_spec.js b/test/nodes/core/storage/10-file_spec.js
index 9d5aa033f..19026d457 100644
--- a/test/nodes/core/storage/10-file_spec.js
+++ b/test/nodes/core/storage/10-file_spec.js
@@ -194,6 +194,55 @@ describe('file Nodes', function() {
             });
         });
 
+        it('should append to a file and add newline, except last line of multipart input', function(done) {
+            var flow = [{id:"fileNode1", type:"file", name: "fileNode", "filename":fileToTest, "appendNewline":true, "overwriteFile":false, wires: [["helperNode1"]]},
+                        {id:"helperNode1", type:"helper"}];
+            try {
+                fs.unlinkSync(fileToTest);
+            } catch(err) {
+            }
+            helper.load(fileNode, flow, function() {
+                var n1 = helper.getNode("fileNode1");
+                var n2 = helper.getNode("helperNode1");
+                var count = 0;
+                //var data = ["Line1", "Line2"];
+
+                n2.on("input", function (msg) {
+                    try {
+                        msg.should.have.property("payload");
+                        //data.should.containDeep([msg.payload]);
+                        if (count === 3) {
+                            var f = fs.readFileSync(fileToTest).toString();
+                            if (os.type() !== "Windows_NT") {
+                                f.should.have.length(23);
+                                f.should.equal("Line1\nLine2\nLine3\nLine4");
+                            }
+                            else {
+                                f.should.have.length(23);
+                                f.should.equal("Line1\r\nLine2\r\nLine3\r\nLine4");
+                            }
+                            done();
+                        }
+                        count++;
+                    }
+                    catch (e) {
+                        done(e);
+                    }
+                });
+
+                n1.receive({payload:"Line1",parts:{index:0,type:"string"}});    // string
+                setTimeout(function() {
+                    n1.receive({payload:"Line2",parts:{index:1,type:"string"}});    // string
+                },30);
+                setTimeout(function() {
+                    n1.receive({payload:"Line3",parts:{index:2,type:"string"}});    // string
+                },60);
+                setTimeout(function() {
+                    n1.receive({payload:"Line4",parts:{index:3,type:"string",count:4}});    // string
+                },90);
+            });
+        });
+
         it('should append to a file after it has been deleted ', function(done) {
             var flow = [{id:"fileNode1", type:"file", name: "fileNode", "filename":fileToTest, "appendNewline":false, "overwriteFile":false, wires: [["helperNode1"]]},
                         {id:"helperNode1", type:"helper"}];