diff --git a/rtl/objpas/classes/streams.inc b/rtl/objpas/classes/streams.inc
index 1232c3fd4c..9ea6c646c1 100644
--- a/rtl/objpas/classes/streams.inc
+++ b/rtl/objpas/classes/streams.inc
@@ -833,23 +833,50 @@ end;
   
 {$warnings off}
 function TStreamAdapter.Read(pv: Pointer; cb: DWORD; pcbRead: PDWORD): HResult; stdcall;
+var
+  readcount: Longint;
 begin
-  runerror(217);
-end;
+  if pv = nil then
+  begin
+    Result := E_INVALIDARG;
+    Exit;
+  end;
 
+  readcount := FStream.Read(pv^, cb);
+  if pcbRead <> nil then pcbRead^ := readcount;
+  Result := S_OK;
+end;
 
 function TStreamAdapter.Write(pv: Pointer; cb: DWORD; pcbWritten: PDWORD): HResult; stdcall;
+var
+  writecount: Longint;
 begin
-  runerror(217);
-end;
+  if pv = nil then
+  begin
+    Result := E_INVALIDARG;
+    Exit;
+  end;
 
+  writecount := FStream.Write(pv^, cb);
+  if pcbWritten <> nil then pcbWritten^ := writecount;
+  Result := S_OK;
+end;
 
 function TStreamAdapter.Seek(dlibMove: Largeint; dwOrigin: Longint; out libNewPosition: Largeint): HResult; stdcall;
+var
+  newpos: Int64;
 begin
-  runerror(217);
+  case dwOrigin of
+    STREAM_SEEK_SET: newpos := FStream.Seek(dlibMove, soBeginning);
+    STREAM_SEEK_CUR: newpos := FStream.Seek(dlibMove, soCurrent);
+    STREAM_SEEK_END: newpos := FStream.Seek(dlibMove, soEnd);
+    else begin Result := E_INVALIDARG; exit; end;
+  end;
+  if @libNewPosition <> nil then
+    libNewPosition := newpos;
+  Result := S_OK;
 end;
 
-
 function TStreamAdapter.SetSize(libNewSize: Largeint): HResult; stdcall;
 begin
   runerror(217);
@@ -888,9 +915,25 @@ end;
 
 function TStreamAdapter.Stat(out statstg: TStatStg; grfStatFlag: Longint): HResult; stdcall;
 begin
-  runerror(217);
-end;
+  if grfStatFlag in [STATFLAG_DEFAULT,STATFLAG_NOOPEN,STATFLAG_NONAME] then
+  begin
+    if @statstg <> nil then
+    begin
+      fillchar(statstg, sizeof(TStatStg),#0);
+      
+      { //TODO handle pwcsName
+        if grfStatFlag = STATFLAG_DEFAULT then
+          runerror(217) //Result :={$ifdef windows} STG_E_INVALIDFLAG{$else}E_INVALID_FLAG{$endif}
+      }
 
+      statstg.dwType := STGTY_STREAM;
+      statstg.cbSize := FStream.Size;
+      statstg.grfLocksSupported := LOCK_WRITE;
+    end;
+    Result := S_OK;
+  end else
+    Result := STG_E_INVALIDFLAG
+end; 
 
 function TStreamAdapter.Clone(out stm: IStream): HResult; stdcall;
 begin
diff --git a/rtl/objpas/types.pp b/rtl/objpas/types.pp
index 6c4836971a..fac75e6bb0 100644
--- a/rtl/objpas/types.pp
+++ b/rtl/objpas/types.pp
@@ -148,7 +148,8 @@ const
   LOCK_EXCLUSIVE = 2;
   LOCK_ONLYONCE  = 4;
 
-  E_FAIL = HRESULT($80004005);
+  E_FAIL 		      = HRESULT($80004005);
+  E_INVALIDARG                = HRESULT($80070057);
 
   STG_E_INVALIDFUNCTION       = HRESULT($80030001);
   STG_E_FILENOTFOUND          = HRESULT($80030002);
@@ -193,6 +194,10 @@ const
   STG_S_RETRYNOW              = $00030202;
   STG_S_MONITORING            = $00030203;
 
+  STATFLAG_DEFAULT   	      = 0;
+  STATFLAG_NONAME    	      = 1;
+  STATFLAG_NOOPEN    	      = 2; 
+
 type
   PCLSID = PGUID;
   TCLSID = TGUID;