diff --git a/include/libc7zip.h b/include/libc7zip.h
index 94fd324..960ac4a 100644
--- a/include/libc7zip.h
+++ b/include/libc7zip.h
@@ -40,6 +40,12 @@ typedef void (*set_completed_cb_t)(int64_t id, int64_t complete_value);
 typedef out_stream *(*get_stream_cb_t)(int64_t id, int64_t index);
 typedef void (*set_operation_result_cb_t)(int64_t id, int32_t operation_result);
 
+// MultiVolumeCallback functions
+typedef char *(*get_first_volume_name_cb_t)(int64_t id);
+typedef int (*move_to_volume_cb_t)(int64_t id, char *volumeName);
+typedef unsigned long long (*get_current_volume_size_cb_t)(int64_t id);
+typedef in_stream *(*open_current_volume_stream_cb_t)(int64_t id);
+
 typedef struct in_stream_def {
   int64_t id;
 	seek_cb_t seek_cb;
@@ -65,6 +71,25 @@ MYEXPORT void out_stream_free(out_stream *s);
 struct archive;
 typedef struct archive archive;
 MYEXPORT archive *archive_open(lib *l, in_stream *is, int32_t by_signature);
+MYEXPORT archive *archive_open_ex(lib *l, in_stream *is, const char *password, int32_t by_signature);
+
+struct multivolume_callback;
+typedef struct multivolume_callback multivolume_callback;
+
+typedef struct multivolume_callback_def {
+  int64_t id;
+  get_first_volume_name_cb_t get_first_volume_name_cb;
+  move_to_volume_cb_t move_to_volume_cb;
+  get_current_volume_size_cb_t get_current_volume_size_cb;
+  open_current_volume_stream_cb_t open_current_volume_stream_cb;
+} multivolume_callback_def;
+
+MYEXPORT multivolume_callback *multivolume_callback_new();
+MYEXPORT multivolume_callback_def *multivolume_callback_get_def(multivolume_callback *ec);
+MYEXPORT void multivolume_callback_free(multivolume_callback *ec);
+
+MYEXPORT archive *archive_multiopen(lib *l, multivolume_callback *mc, const char *password, int32_t by_signature);
+
 MYEXPORT void archive_close(archive *a);
 MYEXPORT void archive_free(archive *a);
 MYEXPORT int64_t archive_get_item_count(archive *a);
diff --git a/src/context.cc b/src/context.cc
index 33e1975..a635cc3 100644
--- a/src/context.cc
+++ b/src/context.cc
@@ -80,6 +80,37 @@ struct out_stream {
 	CbSequentialOutStream *strm;
 };
 
+
+class CbMultiVolumeCallback : public C7ZipMultiVolumes {
+public:
+	multivolume_callback_def m_def;
+
+	CbMultiVolumeCallback() {
+		// muffin
+	}
+
+	virtual wstring GetFirstVolumeName() {
+		return FromCString(m_def.get_first_volume_name_cb(m_def.id));
+	}
+	virtual bool MoveToVolume(const wstring & volumeName) {
+		char *retVolCName = ToCString(volumeName);
+		std::string _volumeName = retVolCName;
+		free(retVolCName);
+		return (bool)m_def.move_to_volume_cb(m_def.id, (char *)_volumeName.c_str());
+	}
+	virtual unsigned __int64 GetCurrentVolumeSize() {
+		return m_def.get_current_volume_size_cb(m_def.id);
+	}
+	virtual C7ZipInStream * OpenCurrentVolumeStream() {
+		in_stream *is = m_def.open_current_volume_stream_cb(m_def.id);
+		return is->strm;
+	}
+
+	virtual ~CbMultiVolumeCallback() {
+		// muffin
+	}
+};
+
 class CbExtractCallback : public C7ZipExtractCallback {
 public:
 	extract_callback_def m_def;
@@ -198,6 +229,47 @@ MYEXPORT archive *archive_open(lib *l, in_stream *s, int32_t by_signature) {
 	return a;
 }
 
+MYEXPORT archive *archive_open_ex(lib *l, in_stream *s, const char *password, int32_t by_signature) {
+	C7ZipArchive *arch = NULL;
+	if (!l->_lib->OpenArchive(s->strm, &arch, FromCString((char *)password), by_signature != 0)) {
+		return NULL;
+	}
+
+	archive *a = (archive*)calloc(1, sizeof(archive));
+	a->arch = arch;
+	return a;
+}
+
+struct multivolume_callback {
+	CbMultiVolumeCallback *cb;
+};
+
+MYEXPORT multivolume_callback *multivolume_callback_new() {
+	multivolume_callback *mc = (multivolume_callback *)calloc(1, sizeof(multivolume_callback));
+	mc->cb = new CbMultiVolumeCallback();
+	return mc;
+}
+
+MYEXPORT multivolume_callback_def *multivolume_callback_get_def(multivolume_callback *mc) {
+	return &mc->cb->m_def;
+}
+
+MYEXPORT void multivolume_callback_free(multivolume_callback *mc) {
+	delete mc->cb;
+	free(mc);
+}
+
+MYEXPORT archive *archive_multiopen(lib *l, multivolume_callback *mc, const char *password, int32_t by_signature) {
+	C7ZipArchive *arch = NULL;
+	if (!l->_lib->OpenMultiVolumeArchive(mc->cb, &arch, FromCString((char *)password), by_signature != 0)) {
+		return NULL;
+	}
+
+	archive *a = (archive*)calloc(1, sizeof(archive));
+	a->arch = arch;
+	return a;
+}
+
 MYEXPORT void archive_close(archive *a) {
 	a->arch->Close();
 }
diff --git a/vendor/lib7zip/Lib7Zip/7ZipArchive.cpp b/vendor/lib7zip/Lib7Zip/7ZipArchive.cpp
index 662b2df..d5aff46 100644
--- a/vendor/lib7zip/Lib7Zip/7ZipArchive.cpp
+++ b/vendor/lib7zip/Lib7Zip/7ZipArchive.cpp
@@ -140,10 +140,15 @@ class CCustomArchiveExtractCallback:
 	C7ZipSequentialOutStreamWrap * _outFileStreamSpec;
 	CMyComPtr<ISequentialOutStream> _outFileStream;
 	C7ZipSequentialOutStream * m_pSequentialOutStream;
-public:
-	CCustomArchiveExtractCallback(C7ZipExtractCallback *pCallback) :
-		m_pCallback(pCallback) {
 
+	const C7ZipArchive * m_pArchive;
+	const C7ZipArchiveItem * m_pItem;
+public:
+	CCustomArchiveExtractCallback(C7ZipExtractCallback *pCallback,const C7ZipArchive * pArchive,const C7ZipArchiveItem * pItem) :
+		m_pCallback(pCallback),
+		m_pArchive(pArchive),
+		m_pItem(pItem)
+	{
 	}
 };
 
@@ -253,7 +258,8 @@ bool C7ZipArchiveImpl::Extract(const C7ZipArchiveItem * pArchiveItem, C7ZipSeque
 }
 
 bool C7ZipArchiveImpl::ExtractSeveral(unsigned int *indexList, int numIndices, C7ZipExtractCallback *pCallback) {
-	CCustomArchiveExtractCallback *extractCallbackSpec = new CCustomArchiveExtractCallback(pCallback);
+	C7ZipArchiveItem * pItem = dynamic_cast<C7ZipArchiveItem *>(m_ArchiveItems[0]);
+	CCustomArchiveExtractCallback *extractCallbackSpec = new CCustomArchiveExtractCallback(pCallback, this, pItem);
 	CMyComPtr<IArchiveExtractCallback> extractCallback(extractCallbackSpec);
 
 	return m_pInArchive->Extract(indexList, numIndices, false, extractCallbackSpec) == S_OK;
@@ -387,7 +393,20 @@ STDMETHODIMP CCustomArchiveExtractCallback::SetOperationResult(Int32 operationRe
 
 STDMETHODIMP CCustomArchiveExtractCallback::CryptoGetTextPassword(BSTR *password)
 {
-	return E_NOTIMPL;
+	wstring strPassword(L"");
+
+	if (m_pItem->IsPasswordSet())
+		strPassword = m_pItem->GetArchiveItemPassword();
+	else if (m_pArchive->IsPasswordSet())
+		strPassword = m_pArchive->GetArchivePassword();
+	
+#ifdef _WIN32
+	return StringToBstr(strPassword.c_str(), password);
+#else
+	*password = ::SysAllocString(strPassword.c_str());
+	
+	return S_OK;
+#endif
 }
 
 // ------------------------------