diff --git a/dlangide.visualdproj b/dlangide.visualdproj
index aff27ae..ae3a58b 100644
--- a/dlangide.visualdproj
+++ b/dlangide.visualdproj
@@ -66,7 +66,7 @@
   <debuglevel>0</debuglevel>
   <debugids />
   <versionlevel>0</versionlevel>
-  <versionids>Unicode USE_FREETYPE</versionids>
+  <versionids>Unicode</versionids>
   <dump_source>0</dump_source>
   <mapverbosity>3</mapverbosity>
   <createImplib>0</createImplib>
diff --git a/src/dlangide/ui/frame.d b/src/dlangide/ui/frame.d
index cf3e11f..d1034dc 100644
--- a/src/dlangide/ui/frame.d
+++ b/src/dlangide/ui/frame.d
@@ -12,6 +12,7 @@ import dlangui.widgets.toolbars;
 import dlangui.widgets.combobox;
 import dlangui.dialogs.dialog;
 import dlangui.dialogs.filedlg;
+import dlangui.core.stdaction;
 
 import dlangide.ui.commands;
 import dlangide.ui.wspanel;
@@ -23,6 +24,13 @@ import dlangide.workspace.project;
 import std.conv;
 import std.utf;
 import std.algorithm;
+import std.path;
+
+bool isSupportedSourceTextFileFormat(string filename) {
+    return (filename.endsWith(".d") || filename.endsWith(".txt") || filename.endsWith(".cpp") || filename.endsWith(".h") || filename.endsWith(".c")
+        || filename.endsWith(".json") || filename.endsWith(".dd") || filename.endsWith(".ddoc") || filename.endsWith(".xml") || filename.endsWith(".html")
+        || filename.endsWith(".html") || filename.endsWith(".css") || filename.endsWith(".log") || filename.endsWith(".hpp"));
+}
 
 /// DIDE app frame
 class IDEFrame : AppFrame {
@@ -54,17 +62,24 @@ class IDEFrame : AppFrame {
     /// source file selected in workspace tree
     bool onSourceFileSelected(ProjectSourceFile file, bool activate) {
         Log.d("onSourceFileSelected ", file.filename);
-        int index = _tabs.tabIndex(file.filename);
+        return openSourceFile(file.filename, file, activate);
+    }
+
+    bool openSourceFile(string filename, ProjectSourceFile file = null, bool activate = true) {
+        if (!file)
+            file = _wsPanel.findSourceFileItem(filename);
+        Log.d("openSourceFile ", filename);
+        int index = _tabs.tabIndex(filename);
         if (index >= 0) {
             // file is already opened in tab
             _tabs.selectTab(index, true);
         } else {
             // open new file
-            DSourceEdit editor = new DSourceEdit(file.filename);
-            if (editor.load(file)) {
-                _tabs.addTab(editor, toUTF32(file.name));
-                index = _tabs.tabIndex(file.filename);
-                TabItem tab = _tabs.tab(file.filename);
+            DSourceEdit editor = new DSourceEdit(filename);
+            if (file ? editor.load(file) : editor.load(filename)) {
+                _tabs.addTab(editor, toUTF32(baseName(filename)));
+                index = _tabs.tabIndex(filename);
+                TabItem tab = _tabs.tab(filename);
                 tab.objectParam = file;
                 _tabs.selectTab(index, true);
             } else {
@@ -75,7 +90,7 @@ class IDEFrame : AppFrame {
             }
         }
         if (activate) {
-            focusEditor(file.filename);
+            focusEditor(filename);
         }
         requestLayout();
         return true;
@@ -185,7 +200,12 @@ class IDEFrame : AppFrame {
                     caption = "Open Text File"d;
                     FileDialog dlg = new FileDialog(caption, window, null);
                     dlg.onDialogResult = delegate(Dialog dlg, const Action result) {
-                        //
+						if (result.id == ACTION_OPEN.id) {
+                            string filename = result.stringParam;
+                            if (isSupportedSourceTextFileFormat(filename)) {
+                                openSourceFile(filename);
+                            }
+                        }
                     };
                     dlg.show();
                     return true;
diff --git a/src/dlangide/ui/wspanel.d b/src/dlangide/ui/wspanel.d
index 30d4fb3..0dbc6ed 100644
--- a/src/dlangide/ui/wspanel.d
+++ b/src/dlangide/ui/wspanel.d
@@ -65,6 +65,12 @@ class WorkspacePanel : DockWindow {
         return _workspace;
     }
 
+    ProjectSourceFile findSourceFileItem(string filename) {
+        if (_workspace)
+            return _workspace.findSourceFileItem(filename);
+        return null;
+    }
+
     void addProjectItems(TreeItem root, ProjectItem items) {
         for (int i = 0; i < items.childCount; i++) {
             ProjectItem child = items.child(i);
diff --git a/src/dlangide/workspace/project.d b/src/dlangide/workspace/project.d
index 14f928d..c170d59 100644
--- a/src/dlangide/workspace/project.d
+++ b/src/dlangide/workspace/project.d
@@ -7,6 +7,7 @@ import std.path;
 import std.file;
 import std.json;
 import std.utf;
+import std.algorithm;
 
 /// project item
 class ProjectItem {
@@ -218,6 +219,27 @@ class Project : WorkspaceItem {
         return folder;
     }
 
+    /// tries to find source file in project, returns found project source file item, or null if not found
+    ProjectSourceFile findSourceFileItem(ProjectItem dir, string filename) {
+        for (int i = 0; i < dir.childCount; i++) {
+            ProjectItem item = dir.child(i);
+            if (item.isFolder) {
+                ProjectSourceFile res = findSourceFileItem(item, filename);
+                if (res)
+                    return res;
+            } else {
+                ProjectSourceFile res = cast(ProjectSourceFile)item;
+                if (res && res.filename.equal(filename))
+                    return res;
+            }
+        }
+        return null;
+    }
+
+    ProjectSourceFile findSourceFileItem(string filename) {
+        return findSourceFileItem(_items, filename);
+    }
+
     override bool load(string fname = null) {
         if (fname.length > 0)
             filename = fname;
diff --git a/src/dlangide/workspace/workspace.d b/src/dlangide/workspace/workspace.d
index 75afed2..003ad7e 100644
--- a/src/dlangide/workspace/workspace.d
+++ b/src/dlangide/workspace/workspace.d
@@ -31,6 +31,16 @@ class Workspace : WorkspaceItem {
         return _projects;
     }
 
+    /// tries to find source file in one of projects, returns found project source file item, or null if not found
+    ProjectSourceFile findSourceFileItem(string filename) {
+        foreach (Project p; _projects) {
+            ProjectSourceFile res = p.findSourceFileItem(filename);
+            if (res)
+                return res;
+        }
+        return null;
+    }
+
     override bool load(string fname = null) {
         if (fname.length > 0)
             filename = fname;