shell: Convert the filesystem shell folder to Unicode.

dlls/shell32/shfldr.h

@@ -69,5 +69,5 @@ static inline int SHELL32_GUIDToStringW (REFGUID guid, LPWSTR str)
             guid->Data4[4], guid->Data4[5], guid->Data4[6], guid->Data4[7]);
 }
 
-void SHELL_FS_ProcessDisplayFilename(LPSTR szPath, DWORD dwFlags);
+void SHELL_FS_ProcessDisplayFilename(LPWSTR szPath, DWORD dwFlags);
 BOOL SHELL_FS_HideExtension(LPWSTR pwszPath);

dlls/shell32/shfldr_desktop.c

@@ -682,16 +682,18 @@ static HRESULT WINAPI ISF_Desktop_fnGetDisplayNameOf (IShellFolder2 * iface,
             if ((GET_SHGDN_FOR(dwFlags) == SHGDN_FORPARSING) &&
                 (GET_SHGDN_RELATION(dwFlags) != SHGDN_INFOLDER))
             {
-                WideCharToMultiByte(CP_ACP, 0, This->sPathTarget, -1, strRet->u.cStr, MAX_PATH,
-                                    NULL, NULL);
-                PathAddBackslashA(strRet->u.cStr);
-                cLen = lstrlenA(strRet->u.cStr);
+                lstrcpynW(wszPath, This->sPathTarget, MAX_PATH - 1);
+                PathAddBackslashW(wszPath);
+                cLen = lstrlenW(wszPath);
             }
 
-            _ILSimpleGetText (pidl, strRet->u.cStr + cLen, MAX_PATH - cLen);
+            _ILSimpleGetTextW(pidl, wszPath + cLen, MAX_PATH - cLen);
 
             if (!_ILIsFolder(pidl))
-                SHELL_FS_ProcessDisplayFilename(strRet->u.cStr, dwFlags);
+                SHELL_FS_ProcessDisplayFilename(wszPath, dwFlags);
+
+            WideCharToMultiByte(CP_ACP, 0, wszPath, -1, strRet->u.cStr, MAX_PATH,
+                                NULL, NULL);
         }
     }
     else