diff --git a/lib/msoffice.js b/lib/msoffice.js
index 13ad583..8aeadc8 100644
--- a/lib/msoffice.js
+++ b/lib/msoffice.js
@@ -1,4 +1,5 @@
 // msoffice.js
+// Namhyeon Go <abuse@catswords.net>
 // https://github.com/gnh1201/welsonjs
 var STD = require("lib/std");
 var SYS = require("lib/system");
@@ -114,7 +115,7 @@ function Excel() {
     this.version = this.application.Version;
     this.application.Visible = true;
 
-    console.info("Microsoft Office Excel:", this.version);
+    console.info("Microsoft Office Excel", this.version);
 
     this.currentWorkbook = null;
     this.currentWorksheet = null;
@@ -127,11 +128,11 @@ function Excel() {
                 filename = SYS.getCurrentWorkingDirectory() + "\\" + filename;  // get absolute path
             }
             if (FILE.fileExists(filename)) {
-                console.warn("Found the file:", filename);
+                console.info("FOUND", filename);
                 this.application.Workbooks.Open(filename);
                 this.currentWorkbook = this.application.ActiveWorkbook;
             } else {
-                console.warn("File not exists!");
+                console.warn("NOT FOUND", filename);
                 this.currentWorkbook = this.application.Workbooks.Add();
             }
         } else {
@@ -173,6 +174,8 @@ function Excel() {
             this.currentWorksheet = this.currentWorkbook.Worksheets(idx);
         }
         
+        console.log(typeof this.currentWorksheet);
+        
         return this;
     };
 
@@ -215,12 +218,48 @@ Excel.Cell = function(cell) {
 // EXAMPLE: new Office.PowerPoint()
 function PowerPoint() {
     this.application = CreateObject("PowerPoint.Application");
+    this.version = this.application.Version;
+    this.application.Visible = true;
+
+    console.info("Microsoft Office PowerPoint", this.version);
+
+    this.open = function(filename) {
+        if (typeof filename !== "undefined") {
+            // check type of the path
+            if (filename.indexOf(":\\") < 0 && filename.indexOf(":/") < 0) {
+                filename = SYS.getCurrentWorkingDirectory() + "\\" + filename;  // get absolute path
+            }
+            if (FILE.fileExists(filename)) {
+                console.info("FOUND", filename);
+            } else {
+                console.warn("NOT FOUND", filename);
+            }
+        }
+    };
 }
 PowerPoint.SupportedFileTypes = FileTypes.PowerPoint;
 
 // EXAMPLE: new Office.Word()
 function Word() {
     this.application = CreateObject("Word.Application");
+    this.version = this.application.Version;
+    this.application.Visible = true;
+
+    console.info("Microsoft Office Word", this.version);
+	
+    this.open = function(filename) {
+        if (typeof filename !== "undefined") {
+            // check type of the path
+            if (filename.indexOf(":\\") < 0 && filename.indexOf(":/") < 0) {
+                filename = SYS.getCurrentWorkingDirectory() + "\\" + filename;  // get absolute path
+            }
+            if (FILE.fileExists(filename)) {
+                console.info("FOUND", filename);
+            } else {
+                console.warn("NOT FOUND", filename);
+            }
+        }
+    };
 }
 Word.SupportedFileTypes = FileTypes.Word;
 
@@ -228,7 +267,7 @@ exports.Excel = Excel;
 exports.PowerPoint = PowerPoint;
 exports.Word = Word;
 
-exports.VERSIONINFO = "Microsoft Office interface (msoffice.js) version 0.1.8";
+exports.VERSIONINFO = "Microsoft Office interface (msoffice.js) version 0.1.9";
 exports.AUTHOR = "abuse@catswords.net";
 exports.global = global;
 exports.require = global.require;
diff --git a/officeloader.js b/officeloader.js
index 191664a..224aa8f 100644
--- a/officeloader.js
+++ b/officeloader.js
@@ -1,13 +1,12 @@
 // officeloader.js
 // Namhyeon Go <abuse@catswords.net>
 // https://github.com/gnh1201/welsonjs
-
 var SYS = require("lib/system");
 var Office = require("lib/msoffice");
 var ChatGPT = require("lib/chatgpt");
 
 function main(args) {
-    // 기존 파일을 여는 경우 인자에 파일 경로 추가
+    // EXAMPLE: cscript app.js officeloader data\example.xlsx
     if (args.length > 0) {
         var filename = args[0];
         open(filename);
@@ -17,22 +16,56 @@ function main(args) {
 }
 
 function open(filename) {
-    // 엑셀 인스턴스 생성
-    var excel = new Office.Excel();
-    
-    // 엑셀 열기
-    excel.open(filename);
-    
-    // .... 여기서 작업하세요 ....
+    var filetypes = [
+        {"application": "excel", "filetypes": Office.Excel.SupportedFileTypes},
+        {"application": "powerpoint", "filetypes": Office.PowerPoint.SupportedFileTypes},
+        {"application": "word", "filetypes": Office.Word.SupportedFileTypes}
+    ];
 
-    // 엑셀 닫기
-    //excel.close();
+    var resolved_filetype = filetypes.reduce(function(a, x) {
+        if (a == '') {
+            var application = x.application;
+            var extensions = x.filetypes.reduce(function(b, x) {
+                return b.concat(x.extension);
+            }, []);
+
+            return extensions.reduce(function(b, x) {
+                return (b == '' && filename.lastIndexOf(x) > -1 ? application : b);
+            }, '');
+        }
+
+        return a;
+    }, '');
+    
+    switch (resolved_filetype) {
+        case "excel": {
+            var excel = new Office.Excel();   // Create an Excel instance
+            excel.open(filename);  // Open the Excel instance
+            break;
+        }
+        
+        case "powerpoint": {
+            var powerpoint = new Office.PowerPoint();   // Create a PowerPoint instance
+            powerpoint.open(filename);  // Open the PowerPoint instance
+            break;
+        }
+
+        case "word": {
+            var word = new Office.Word();   // Create an Word instance
+            word.open(filename);  // Open the Word instance
+            break;
+        }
+
+        default: {
+            console.error("Not supported filetype");
+        }
+    }
 }
 
 function test() {
     // 엑셀 인스턴스 생성
     var excel = new Office.Excel();
-    
+
     // 질문 목록
     var questions = [
         "엄마가 좋아 아빠가 좋아?",