diff --git a/lib/msoffice.js b/lib/msoffice.js
index 605ee60..6aee4bc 100644
--- a/lib/msoffice.js
+++ b/lib/msoffice.js
@@ -1,5 +1,7 @@
-// msoffice.js
+var STD = require("lib/std");
+var FILE = require("lib/file");
 
+// msoffice.js
 var FileTypes = {};
 
 // https://support.microsoft.com/en-au/office/file-formats-that-are-supported-in-excel-0943ff2c-6014-4e8d-aaea-b83d51d46247
@@ -104,29 +106,86 @@ FileTypes.Word = [
     {"extension": [".xps"], "type": "XPS Document"}
 ];
 
-// Example: new Office.Word()
+// Example: new Office.Excel()
 function Excel() {
     this.Application = CreateObject("Excel.Application");
-    this.SupportedFileTypes = FileTypes.Excel;
-}
+    this.Version = this.Application.Version;
+    this.Application.Visible = true;
+
+    console.info("Microsoft Excel Version:", this.Version);
+
+    this.CurrentWorkbook = null;
+    this.CurrentWorksheet = null;
+
+    this.open = function(filename) {
+        if (typeof filename !== "undefined") {
+            Application.Workbooks.Open(filename);
+            this.CurrentWorkbook = Application.ActiveWorkbook;
+        } else {
+            this.CurrentWorkbook = this.Application.Workbooks.Add();
+        }
+        this.selectWorksheet(1);
+    };
+
+    this.close = function() {
+        try {
+            this.CurrentWorksheet = null;
+            this.CurrentWorkbook.Close();
+            this.CurrentWorkbook = null;
+            this.Application.Quit();
+            this.Application = null;
+        } catch (e) {
+            this.CurrentWorksheet = null;
+            this.CurrentWorkbook = null;
+            this.Application = null;
+        }
+    };
+
+    this.saveAs = function(filename) {
+        try {
+            this.CurrentWorkbook.saveAs(filename);
+            return FILE.fileExists(filename);
+        } catch (e) {
+            console.error("Could not save a file:", e.message);
+            return false;
+        }
+    };
+
+    this.selectWorksheet = function(idx) {
+        if (idx == 0) {
+            this.CurrentWorksheet = this.Application.ActiveSheet;
+        } else {
+            this.CurrentWorksheet = this.CurrentWorkbook.Worksheets(idx);
+        }
+    };
+    
+    this.getValueByCell = function(row, col) {
+        return this.CurrentWorksheet.Cells(row, col).Value;
+    };
+
+    this.setValueByCell = function(row, col, value) {
+        return this.CurrentWorksheet.Cells(row, col).Value = value;
+    };
+};
+Excel.SupportedFileTypes = FileTypes.Excel;
 
 // Example: new Office.PowerPoint()
 function PowerPoint() {
     this.Application = CreateObject("PowerPoint.Application");
-    this.SupportedFileTypes = FileTypes.PowerPoint;
 }
+PowerPoint.SupportedFileTypes = FileTypes.PowerPoint;
 
 // Example: new Office.Word()
 function Word() {
     this.Application = CreateObject("Word.Application");
-    this.SupportedFileTypes = FileTypes.Word;
 }
+Word.SupportedFileTypes = FileTypes.Word;
 
 exports.Excel = Excel;
 exports.PowerPoint = PowerPoint;
 exports.Word = Word;
 
-exports.VERSIONINFO = "Microsoft Office interface (msoffice.js) version 0.1";
+exports.VERSIONINFO = "Microsoft Office interface (msoffice.js) version 0.1.1";
 exports.AUTHOR = "abuse@catswords.net";
 exports.global = global;
 exports.require = global.require;
diff --git a/officetest.js b/officetest.js
new file mode 100644
index 0000000..ee99625
--- /dev/null
+++ b/officetest.js
@@ -0,0 +1,13 @@
+var Office = require("lib/msoffice");
+
+function main(args) {
+	var excel = new Office.Excel();
+	
+	excel.open();
+	
+	excel.setValueByCell(1, 1, "hello world");
+	
+	excel.close();
+}
+
+exports.main = main;
\ No newline at end of file