diff --git a/dist/index.js b/dist/index.js
index 3c239ec..fcf51b1 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -107,6 +107,32 @@ const sendMessage = async (token, message) => {
 module.exports = sendMessage;
 
 
+/***/ }),
+
+/***/ 82:
+/***/ (function(__unusedmodule, exports) {
+
+"use strict";
+
+// We use any as a valid input type
+/* eslint-disable @typescript-eslint/no-explicit-any */
+Object.defineProperty(exports, "__esModule", { value: true });
+/**
+ * Sanitizes an input into a string so it can be passed into issueCommand safely
+ * @param input input to sanitize into a string
+ */
+function toCommandValue(input) {
+    if (input === null || input === undefined) {
+        return '';
+    }
+    else if (typeof input === 'string' || input instanceof String) {
+        return input;
+    }
+    return JSON.stringify(input);
+}
+exports.toCommandValue = toCommandValue;
+//# sourceMappingURL=utils.js.map
+
 /***/ }),
 
 /***/ 87:
@@ -116,6 +142,42 @@ module.exports = require("os");
 
 /***/ }),
 
+/***/ 102:
+/***/ (function(__unusedmodule, exports, __webpack_require__) {
+
+"use strict";
+
+// For internal use, subject to change.
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+// We use any as a valid input type
+/* eslint-disable @typescript-eslint/no-explicit-any */
+const fs = __importStar(__webpack_require__(747));
+const os = __importStar(__webpack_require__(87));
+const utils_1 = __webpack_require__(82);
+function issueCommand(command, message) {
+    const filePath = process.env[`GITHUB_${command}`];
+    if (!filePath) {
+        throw new Error(`Unable to find environment variable for file command ${command}`);
+    }
+    if (!fs.existsSync(filePath)) {
+        throw new Error(`Missing file at path: ${filePath}`);
+    }
+    fs.appendFileSync(filePath, `${utils_1.toCommandValue(message)}${os.EOL}`, {
+        encoding: 'utf8'
+    });
+}
+exports.issueCommand = issueCommand;
+//# sourceMappingURL=file-command.js.map
+
+/***/ }),
+
 /***/ 104:
 /***/ (function(__unusedmodule, __unusedexports, __webpack_require__) {
 
@@ -186,19 +248,27 @@ module.exports = require("https");
 /***/ 325:
 /***/ (function(module) {
 
-const buildMessage = (channel, text, optional = {}) => {
+const buildMessage = (channel = "", text = "", optional = {}) => {
   const message = {
     channel,
-    text
+    text,
   };
 
-  Object.keys(optional).forEach(name => {
+  message.text = restoreEscapedNewLine(message.text);
+  message.text = restoreEscapedTab(message.text);
+
+  Object.keys(optional).forEach((name) => {
     message[name] = optional[name];
   });
 
   return message;
 };
 
+const restoreEscapedNewLine = (text) =>
+  text.replace(/\\r\\n/g, "\n").replace(/\\n/g, "\n");
+
+const restoreEscapedTab = (text) => text.replace(/\\t/g, "\t");
+
 module.exports = buildMessage;
 
 
@@ -218,6 +288,7 @@ var __importStar = (this && this.__importStar) || function (mod) {
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 const os = __importStar(__webpack_require__(87));
+const utils_1 = __webpack_require__(82);
 /**
  * Commands
  *
@@ -271,28 +342,14 @@ class Command {
         return cmdStr;
     }
 }
-/**
- * Sanitizes an input into a string so it can be passed into issueCommand safely
- * @param input input to sanitize into a string
- */
-function toCommandValue(input) {
-    if (input === null || input === undefined) {
-        return '';
-    }
-    else if (typeof input === 'string' || input instanceof String) {
-        return input;
-    }
-    return JSON.stringify(input);
-}
-exports.toCommandValue = toCommandValue;
 function escapeData(s) {
-    return toCommandValue(s)
+    return utils_1.toCommandValue(s)
         .replace(/%/g, '%25')
         .replace(/\r/g, '%0D')
         .replace(/\n/g, '%0A');
 }
 function escapeProperty(s) {
-    return toCommandValue(s)
+    return utils_1.toCommandValue(s)
         .replace(/%/g, '%25')
         .replace(/\r/g, '%0D')
         .replace(/\n/g, '%0A')
@@ -349,6 +406,8 @@ var __importStar = (this && this.__importStar) || function (mod) {
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 const command_1 = __webpack_require__(431);
+const file_command_1 = __webpack_require__(102);
+const utils_1 = __webpack_require__(82);
 const os = __importStar(__webpack_require__(87));
 const path = __importStar(__webpack_require__(622));
 /**
@@ -375,9 +434,17 @@ var ExitCode;
  */
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 function exportVariable(name, val) {
-    const convertedVal = command_1.toCommandValue(val);
+    const convertedVal = utils_1.toCommandValue(val);
     process.env[name] = convertedVal;
-    command_1.issueCommand('set-env', { name }, convertedVal);
+    const filePath = process.env['GITHUB_ENV'] || '';
+    if (filePath) {
+        const delimiter = '_GitHubActionsFileCommandDelimeter_';
+        const commandValue = `${name}<<${delimiter}${os.EOL}${convertedVal}${os.EOL}${delimiter}`;
+        file_command_1.issueCommand('ENV', commandValue);
+    }
+    else {
+        command_1.issueCommand('set-env', { name }, convertedVal);
+    }
 }
 exports.exportVariable = exportVariable;
 /**
@@ -393,7 +460,13 @@ exports.setSecret = setSecret;
  * @param inputPath
  */
 function addPath(inputPath) {
-    command_1.issueCommand('add-path', {}, inputPath);
+    const filePath = process.env['GITHUB_PATH'] || '';
+    if (filePath) {
+        file_command_1.issueCommand('PATH', inputPath);
+    }
+    else {
+        command_1.issueCommand('add-path', {}, inputPath);
+    }
     process.env['PATH'] = `${inputPath}${path.delimiter}${process.env['PATH']}`;
 }
 exports.addPath = addPath;
@@ -560,6 +633,13 @@ exports.getState = getState;
 
 module.exports = require("path");
 
+/***/ }),
+
+/***/ 747:
+/***/ (function(module) {
+
+module.exports = require("fs");
+
 /***/ })
 
 /******/ });
\ No newline at end of file
diff --git a/src/build-message.js b/src/build-message.js
index d8d1453..e379cfb 100644
--- a/src/build-message.js
+++ b/src/build-message.js
@@ -1,14 +1,22 @@
-const buildMessage = (channel, text, optional = {}) => {
+const buildMessage = (channel = "", text = "", optional = {}) => {
   const message = {
     channel,
-    text
+    text,
   };
 
-  Object.keys(optional).forEach(name => {
+  message.text = restoreEscapedNewLine(message.text);
+  message.text = restoreEscapedTab(message.text);
+
+  Object.keys(optional).forEach((name) => {
     message[name] = optional[name];
   });
 
   return message;
 };
 
+const restoreEscapedNewLine = (text) =>
+  text.replace(/\\r\\n/g, "\n").replace(/\\n/g, "\n");
+
+const restoreEscapedTab = (text) => text.replace(/\\t/g, "\t");
+
 module.exports = buildMessage;