diff --git a/Foundation/include/Poco/Exception.h b/Foundation/include/Poco/Exception.h
index ce6d4d035..d09d4ff99 100644
--- a/Foundation/include/Poco/Exception.h
+++ b/Foundation/include/Poco/Exception.h
@@ -246,6 +246,7 @@ POCO_DECLARE_EXCEPTION(Foundation_API, CreateFileException, FileException)
 POCO_DECLARE_EXCEPTION(Foundation_API, OpenFileException, FileException)
 POCO_DECLARE_EXCEPTION(Foundation_API, WriteFileException, FileException)
 POCO_DECLARE_EXCEPTION(Foundation_API, ReadFileException, FileException)
+POCO_DECLARE_EXCEPTION(Foundation_API, FileNotReadyException, FileException)
 POCO_DECLARE_EXCEPTION(Foundation_API, DirectoryNotEmptyException, FileException)
 POCO_DECLARE_EXCEPTION(Foundation_API, UnknownURISchemeException, RuntimeException)
 POCO_DECLARE_EXCEPTION(Foundation_API, TooManyURIRedirectsException, RuntimeException)
diff --git a/Foundation/src/Exception.cpp b/Foundation/src/Exception.cpp
index a0bfd5849..a1460406e 100644
--- a/Foundation/src/Exception.cpp
+++ b/Foundation/src/Exception.cpp
@@ -169,6 +169,7 @@ POCO_IMPLEMENT_EXCEPTION(CreateFileException, FileException, "Cannot create file
 POCO_IMPLEMENT_EXCEPTION(OpenFileException, FileException, "Cannot open file")
 POCO_IMPLEMENT_EXCEPTION(WriteFileException, FileException, "Cannot write file")
 POCO_IMPLEMENT_EXCEPTION(ReadFileException, FileException, "Cannot read file")
+POCO_IMPLEMENT_EXCEPTION(FileNotReadyException, FileException, "File not ready")
 POCO_IMPLEMENT_EXCEPTION(DirectoryNotEmptyException, FileException, "Directory not empty")
 POCO_IMPLEMENT_EXCEPTION(UnknownURISchemeException, RuntimeException, "Unknown URI scheme")
 POCO_IMPLEMENT_EXCEPTION(TooManyURIRedirectsException, RuntimeException, "Too many URI redirects")
diff --git a/Foundation/src/File_WIN32U.cpp b/Foundation/src/File_WIN32U.cpp
index 75b5da85c..e819ff501 100644
--- a/Foundation/src/File_WIN32U.cpp
+++ b/Foundation/src/File_WIN32U.cpp
@@ -100,7 +100,6 @@ bool FileImpl::existsImpl() const
 		{
 		case ERROR_FILE_NOT_FOUND:
 		case ERROR_PATH_NOT_FOUND:
-		case ERROR_NOT_READY:
 		case ERROR_INVALID_DRIVE:
 			return false;
 		default:
@@ -439,6 +438,8 @@ void FileImpl::handleLastErrorImpl(const std::string& path)
 	case ERROR_CANT_RESOLVE_FILENAME:
 	case ERROR_INVALID_DRIVE:
 		throw PathNotFoundException(path, err);
+	case ERROR_NOT_READY:
+		throw FileNotReadyException(path, err);
 	case ERROR_ACCESS_DENIED:
 		throw FileAccessDeniedException(path, err);
 	case ERROR_ALREADY_EXISTS: