Bumped version 1.0.0.14.

Added auto-change of working folder on drag-n-drop operations.
Added registration of context menu "Use Polang" for .po/.pot/.lang file types.

BrowseCtrl.cpp

@@ -21,7 +21,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include "stdafx.h"
-#include "Polang.h"
 #include "BrowseCtrl.h"
 
 #ifdef _DEBUG
@@ -54,6 +53,12 @@ void CBrowseCtrl::OnDropFiles( HDROP hDropInfo )
 	if ( DragQueryFile( hDropInfo, 0, szItem, _countof( szItem ) ) && ( GetFileAttributes( szItem ) & FILE_ATTRIBUTE_DIRECTORY ) == 0 )
 	{
 		SetWindowText( szItem );
+
+		if ( auto pOwner = GetParent() )
+		{
+			NMHDR hdr = { GetSafeHwnd(), (UINT_PTR)GetDlgCtrlID(), NM_DRAGDROP };
+			pOwner->SendMessage( WM_NOTIFY, (WPARAM)hdr.idFrom, (LPARAM)&hdr );
+		}
 	}
 
 	DragFinish( hDropInfo );

BrowseCtrl.h

@@ -44,3 +44,5 @@ class CBrowseCtrl : public CMFCEditBrowseCtrl
 
 	DECLARE_MESSAGE_MAP()
 };
+
+#define NM_DRAGDROP (NM_FIRST + 1)

Polang.cpp

@@ -28,6 +28,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define new DEBUG_NEW
 #endif
 
+#define Classes		_T("SOFTWARE\\Classes\\")
+#define Verb		_T("\\Shell")
+#define Command		_T("\\Command")
+
 // CPolangApp
 
 BEGIN_MESSAGE_MAP(CPolangApp, CWinAppEx)
@@ -51,13 +55,124 @@ BOOL CPolangApp::InitInstance()
 	INITCOMMONCONTROLSEX InitCtrls = { sizeof( InitCtrls ), ICC_WIN95_CLASSES };
 	InitCommonControlsEx( &InitCtrls );
 
-	CWinApp::InitInstance();
+	__super::InitInstance();
 
 	// Activate "Windows Native" visual manager for enabling themes in MFC controls
 	CMFCVisualManager::SetDefaultManager( RUNTIME_CLASS( CMFCVisualManagerWindows ) );
 
 	SetRegistryKey( AFX_IDS_COMPANY_NAME );
 
+	int nRegister = 0;
+	int nArgs = 0;
+	if ( LPWSTR* szArglist = CommandLineToArgvW( GetCommandLineW(), &nArgs ) )
+	{
+		for ( int i = 1; i < nArgs; ++i )
+		{
+			if ( _tcsicmp( szArglist[ i ] + 1, _T("RegServer") ) == 0 )
+			{
+				nRegister = 1;
+			}
+			else if ( _tcsicmp( szArglist[ i ] + 1, _T( "UnRegServer" ) ) == 0 )
+			{
+				nRegister = -1;
+			}
+		}
+		LocalFree( szArglist );
+	}
+
+	CString sPath;
+	GetModuleFileName( NULL, sPath.GetBuffer( MAX_PATH ), MAX_PATH );
+	sPath.ReleaseBuffer();
+	sPath = CString( _T("\"") ) + sPath + _T("\" \"%1\"");
+
+	const CString sApp = AfxGetAppName();
+	const CString sName = LoadString( IDS_VERB_NAME );
+	const CString sType = LoadString( IDS_TYPE );
+
+	static const LPCTSTR szExts[] = { _T(".po"), _T(".pot"), _T(".lang") };
+	for ( int i = 0; i < 3; ++i )
+	{
+		for ( auto & szExt : szExts )
+		{
+			const CString sDefaultProgId = sApp + szExt;
+
+			CString sProgId;
+			DWORD nSize = 64;
+			DWORD nType = 0;
+			LSTATUS res = SHGetValue( HKEY_CLASSES_ROOT, szExt, NULL, &nType, sProgId.GetBuffer( nSize + 1 ), &nSize );
+			sProgId.ReleaseBuffer();
+			if ( res == ERROR_SUCCESS && nSize && nType == REG_SZ )
+			{
+				// OK
+			}
+			else
+			{
+				// Own extension key
+				sProgId = sDefaultProgId;
+
+				if ( nRegister >= 0 )
+				{
+					res = SHRegSetUSValue( CString( Classes ) + szExt, NULL, REG_SZ,
+						sProgId, sProgId.GetLength() * sizeof( TCHAR ), SHREGSET_HKCU );
+					res = SHRegSetUSValue( CString( Classes ) + szExt, NULL, REG_SZ,
+						sProgId, sProgId.GetLength() * sizeof( TCHAR ), SHREGSET_HKLM );
+
+					res = SHRegSetUSValue( CString( Classes ) + sProgId, NULL, REG_SZ,
+						sType, sType.GetLength() * sizeof( TCHAR ), SHREGSET_HKCU );
+					res = SHRegSetUSValue( CString( Classes ) + sProgId, NULL, REG_SZ,
+						sType, sType.GetLength() * sizeof( TCHAR ), SHREGSET_HKLM );
+				}
+			}
+
+			if ( nRegister >= 0 )
+			{
+				res = SHRegSetUSValue( CString( Classes ) + sProgId + Verb + _T("\\") + sApp, NULL, REG_SZ,
+					sName, sName.GetLength() * sizeof( TCHAR ), SHREGSET_HKCU );
+				res = SHRegSetUSValue( CString( Classes ) + sProgId + Verb + _T( "\\" ) + sApp, NULL, REG_SZ,
+					sName, sName.GetLength() * sizeof( TCHAR ), SHREGSET_HKLM );
+
+				res = SHRegSetUSValue( CString( Classes ) + sProgId + Verb + _T("\\") + sApp + Command, NULL, REG_SZ,
+					sPath, sPath.GetLength() * sizeof( TCHAR ), SHREGSET_HKCU );
+				res = SHRegSetUSValue( CString( Classes ) + sProgId + Verb + _T( "\\" ) + sApp + Command, NULL, REG_SZ,
+					sPath, sPath.GetLength() * sizeof( TCHAR ), SHREGSET_HKLM );
+			}
+			else
+			{
+				SHDeleteValue( HKEY_CLASSES_ROOT, sProgId + Verb + _T("\\") + sApp + Command, NULL );
+				SHDeleteEmptyKey( HKEY_CLASSES_ROOT, sProgId + Verb + _T("\\") + sApp + Command );
+
+				SHDeleteValue( HKEY_CLASSES_ROOT, sProgId + Verb + _T("\\") + sApp, NULL );
+				SHDeleteEmptyKey( HKEY_CLASSES_ROOT, sProgId + Verb + _T("\\") + sApp );
+
+				SHDeleteValue( HKEY_CLASSES_ROOT, sProgId + Verb, NULL );
+				SHDeleteEmptyKey( HKEY_CLASSES_ROOT, sProgId + Verb );
+
+				// Own extension key?
+				if ( sProgId == sDefaultProgId )
+				{
+					SHDeleteValue( HKEY_CLASSES_ROOT, sProgId, NULL );
+
+					SHDeleteEmptyKey( HKEY_CLASSES_ROOT, sProgId );
+
+					// Check for ProgID existence
+					res = SHDeleteEmptyKey( HKEY_CLASSES_ROOT, sProgId );
+					if ( res == ERROR_FILE_NOT_FOUND )
+					{
+						SHDeleteValue( HKEY_CLASSES_ROOT, szExt, NULL );
+						SHDeleteEmptyKey( HKEY_CLASSES_ROOT, szExt );
+					}
+				}
+				else
+				{
+					SHDeleteEmptyKey( HKEY_CLASSES_ROOT, sProgId );
+				}
+			}
+		}
+	}
+	if ( nRegister != 0 )
+		// Registration only
+		return FALSE;
+
 	CPolangDlg dlg;
 	m_pMainWnd = &dlg;
 	dlg.DoModal();

Polang.h

@@ -35,34 +35,38 @@ class CPolangApp : public CWinAppEx
 	CPolangApp();
 
 protected:
-	virtual BOOL InitInstance();
+	virtual BOOL InitInstance() override;
 
 	DECLARE_MESSAGE_MAP()
 };
 
 extern CPolangApp theApp;
 
+// Load string from resources
 inline CString LoadString(UINT nId)
 {
 	CString str;
 	VERIFY( str.LoadString( nId ) );
 	return str;
 }
 
+// Cut off file extension (i.e. extract path + filename only)
 inline CString TrimExtension(LPCTSTR szFilename)
 {
 	if ( ! szFilename || ! *szFilename )
 		return CString();
 	return CString( szFilename, (int)( PathFindExtension( szFilename ) - szFilename ) );
 }
 
+// Cut off file name from path (i.e. extract path only)
 inline CString TrimFileName(LPCTSTR szFilename)
 {
 	if ( ! szFilename || ! *szFilename )
 		return CString();
 	return CString( szFilename, (int)( PathFindFileName( szFilename ) - szFilename ) );
 }
 
+// Check if this is a real file on disk
 inline bool IsFileName(LPCTSTR szFilename)
 {
 	if ( ! szFilename || ! *szFilename )