diff --git a/lib/file.js b/lib/file.js
index f312531..707545a 100644
--- a/lib/file.js
+++ b/lib/file.js
@@ -171,6 +171,20 @@ function loadEnvFromArgs(args, callback) {
     }
 }
 
+function isAbsolutePath(path) {
+    if (typeof path !== "string")
+        return false;
+    
+    path = path.replace(/^\s+/, "").replace(/\s+$/, "");
+
+    if (path.charAt(0) === "\uFEFF")
+        path = path.slice(1);
+
+    return (/^[a-zA-Z]:[\\/]/).test(path) ||
+         (/^[\\/]{2,}/).test(path) ||
+         (/^\//).test(path);
+};
+
 exports.fileExists = fileExists;
 exports.folderExists = folderExists;
 exports.fileGet = fileGet;
@@ -187,10 +201,11 @@ exports.appendFile = appendFile;
 exports.rotateFile = rotateFile;
 exports.loadEnvFromFile = loadEnvFromFile;
 exports.loadEnvFromArgs = loadEnvFromArgs;
+exports.isAbsolutePath = isAbsolutePath;
 
 exports.CdoCharset = PipeIPC.CdoCharset;
 
-exports.VERSIONINFO = "File IO Library (file.js) version 0.2.15";
+exports.VERSIONINFO = "File IO Library (file.js) version 0.2.16";
 exports.AUTHOR = "gnh1201@catswords.re.kr";
 exports.global = global;
 exports.require = global.require;
diff --git a/lib/msoffice.js b/lib/msoffice.js
index d33ff33..eb7c738 100644
--- a/lib/msoffice.js
+++ b/lib/msoffice.js
@@ -23,7 +23,7 @@ function Excel() {
     this.open = function(filename) {
         if (typeof filename !== "undefined") {
             // check type of the path
-            if (filename.indexOf(":\\") < 0 && filename.indexOf(":/") < 0) {
+            if (!FILE.isAbsolutePath(filename)) {
                 filename = SYS.getCurrentWorkingDirectory() + "\\" + filename;  // get absolute path
             }
             if (FILE.fileExists(filename)) {
@@ -227,7 +227,7 @@ exports.Excel = Excel;
 exports.PowerPoint = PowerPoint;
 exports.Word = Word;
 
-exports.VERSIONINFO = "Microsoft Office interface (msoffice.js) version 0.2.1";
+exports.VERSIONINFO = "Microsoft Office interface (msoffice.js) version 0.2.2";
 exports.AUTHOR = "gnh1201@catswords.re.kr";
 exports.global = global;
 exports.require = global.require;