diff --git a/data/example.xlsx b/data/example.xlsx
new file mode 100644
index 00000000..ff4e3f9e
Binary files /dev/null and b/data/example.xlsx differ
diff --git a/lib/msoffice.js b/lib/msoffice.js
index 3ab9a3be..2ec51e43 100644
--- a/lib/msoffice.js
+++ b/lib/msoffice.js
@@ -1,4 +1,5 @@
 var STD = require("lib/std");
+var SYS = require("lib/system");
 var FILE = require("lib/file");
 
 // msoffice.js
@@ -119,12 +120,24 @@ function Excel() {
 
     this.open = function(filename) {
         if (typeof filename !== "undefined") {
-            Application.Workbooks.Open(filename);
-            this.CurrentWorkbook = Application.ActiveWorkbook;
+            // check type of the path
+            if (filename.indexOf(":\\") < 0 && filename.indexOf(":/") < 0) {
+                filename = SYS.getCurrentWorkingDirectory() + "\\" + filename;  // get absolute path
+            }
+            if (FILE.fileExists(filename)) {
+                console.warn("Found the file:", filename);
+                this.Application.Workbooks.Open(filename);
+                this.CurrentWorkbook = this.Application.ActiveWorkbook;
+            } else {
+                console.warn("File not exists!");
+                this.CurrentWorkbook = this.Application.Workbooks.Add();
+            }
         } else {
             this.CurrentWorkbook = this.Application.Workbooks.Add();
         }
         this.selectWorksheet(1);
+
+        return this;
     };
 
     this.close = function() {
@@ -157,6 +170,8 @@ function Excel() {
         } else {
             this.CurrentWorksheet = this.CurrentWorkbook.Worksheets(idx);
         }
+        
+        return this;
     };
     
     this.getValueByPosition = function(row, col) {
@@ -164,7 +179,9 @@ function Excel() {
     };
 
     this.setValueByPosition = function(row, col, value) {
-        return this.CurrentWorksheet.Cells(row, col).Value = value;
+        this.CurrentWorksheet.Cells(row, col).Value = value;
+
+        return this;
     };
 };
 Excel.SupportedFileTypes = FileTypes.Excel;
@@ -185,7 +202,7 @@ exports.Excel = Excel;
 exports.PowerPoint = PowerPoint;
 exports.Word = Word;
 
-exports.VERSIONINFO = "Microsoft Office interface (msoffice.js) version 0.1.2";
+exports.VERSIONINFO = "Microsoft Office interface (msoffice.js) version 0.1.3";
 exports.AUTHOR = "abuse@catswords.net";
 exports.global = global;
 exports.require = global.require;
diff --git a/lib/system.js b/lib/system.js
index 8b2b11be..45455d0b 100644
--- a/lib/system.js
+++ b/lib/system.js
@@ -24,15 +24,15 @@ exports.createProcess = function(cmd) {
 
 exports.getEnvString = function(envName) {
     return (function(s) {
-		switch(s) {
-			case "PROGRAMFILES":
-				return WSH.ExpandEnvironmentStrings("%HOMEDRIVE%\\Program Files");
-			case "PROGRAMFILES(X86)":
-				return WSH.ExpandEnvironmentStrings("%HOMEDRIVE%\\Program Files (x86)");
-			default:
-				return WSH.ExpandEnvironmentStrings('%' + s + '%');
-		}
-	})(envName.toUpperCase());
+        switch(s) {
+            case "PROGRAMFILES":
+                return WSH.ExpandEnvironmentStrings("%HOMEDRIVE%\\Program Files");
+            case "PROGRAMFILES(X86)":
+                return WSH.ExpandEnvironmentStrings("%HOMEDRIVE%\\Program Files (x86)");
+            default:
+                return WSH.ExpandEnvironmentStrings('%' + s + '%');
+        }
+    })(envName.toUpperCase());
 };
 
 exports.get32BitFolder = function() {
@@ -176,6 +176,6 @@ exports.ping = function(address) {
     return WMI.execQuery("Select ResponseTime From Win32_PingStatus where address='" + address + "'").fetch().get("ResponseTime");
 };
 
-exports.VERSIONINFO = "System Module (system.js) version 0.1.1";
+exports.VERSIONINFO = "System Module (system.js) version 0.1.2";
 exports.global = global;
 exports.require = global.require;
diff --git a/officetest.js b/officeloader.js
similarity index 59%
rename from officetest.js
rename to officeloader.js
index 025d690c..dda0e48c 100644
--- a/officetest.js
+++ b/officeloader.js
@@ -1,7 +1,36 @@
+// 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
+    if (args.length > 0) {
+        var filename = args[0];
+        open(filename);
+    } else {
+        test();
+    }
+}
+
+function open(filename) {
+    // 엑셀 인스턴스 생성
+    var excel = new Office.Excel();
+    
+    // 엑셀 열기
+    excel.open(filename);
+    
+    // .... 여기서 작업하세요 ....
+
+    // 엑셀 닫기
+    //excel.close();
+}
+
+function test() {
+    // 엑셀 인스턴스 생성
     var excel = new Office.Excel();
     
     // 질문 목록
@@ -24,7 +53,8 @@ function main(args) {
         i++;
     });
 
+    // 엑셀 닫기
     //excel.close();
 }
 
-exports.main = main;
\ No newline at end of file
+exports.main = main;