diff --git a/aegisub/libaegisub/include/libaegisub/io.h b/aegisub/libaegisub/include/libaegisub/io.h
index eafd0bfd7..bc4c8784d 100644
--- a/aegisub/libaegisub/include/libaegisub/io.h
+++ b/aegisub/libaegisub/include/libaegisub/io.h
@@ -40,7 +40,7 @@ DEFINE_SIMPLE_EXCEPTION_NOINNER(IOAccessRead, IOError, "io/read")
 DEFINE_SIMPLE_EXCEPTION_NOINNER(IOAccessWrite, IOError, "io/write")
 */
 
-std::ifstream* Open(const std::string &file);
+std::ifstream* Open(const std::string &file, bool binary = false);
 
 class Save {
 	std::ofstream *fp;
diff --git a/aegisub/libaegisub/unix/io.cpp b/aegisub/libaegisub/unix/io.cpp
index 50e1ddecd..d48394b43 100644
--- a/aegisub/libaegisub/unix/io.cpp
+++ b/aegisub/libaegisub/unix/io.cpp
@@ -36,7 +36,7 @@
 namespace agi {
 	namespace io {
 
-std::ifstream* Open(const std::string &file) {
+std::ifstream* Open(const std::string &file, bool) {
     LOG_D("agi/io/open/file") << file;
 	acs::CheckFileRead(file);
 
diff --git a/aegisub/libaegisub/windows/io.cpp b/aegisub/libaegisub/windows/io.cpp
index acb93cc8f..5986a286c 100644
--- a/aegisub/libaegisub/windows/io.cpp
+++ b/aegisub/libaegisub/windows/io.cpp
@@ -37,11 +37,11 @@ namespace agi {
 
 using agi::charset::ConvertW;
 
-std::ifstream* Open(const std::string &file) {
+std::ifstream* Open(const std::string &file, bool binary) {
 	LOG_D("agi/io/open/file") << file;
 	acs::CheckFileRead(file);
 
-	std::ifstream *stream = new std::ifstream(ConvertW(file).c_str());
+	std::ifstream *stream = new std::ifstream(ConvertW(file).c_str(), std::ios::in | (binary ? std::ios::binary : 0));
 
 	if (stream->fail()) {
 		delete stream;
diff --git a/aegisub/src/ass_attachment.cpp b/aegisub/src/ass_attachment.cpp
index 6bba6dfec..9f7d77e1b 100644
--- a/aegisub/src/ass_attachment.cpp
+++ b/aegisub/src/ass_attachment.cpp
@@ -38,13 +38,19 @@
 
 #ifndef AGI_PRE
 #include <wx/filename.h>
-#include <wx/wfstream.h>
+
+#include <istream>
 #endif
 
 #include "ass_attachment.h"
 
+#include "compat.h"
+
+#include <libaegisub/io.h>
+#include <libaegisub/scoped_ptr.h>
+
 AssAttachment::AssAttachment(wxString name)
-: data(new std::vector<unsigned char>)
+: data(new std::vector<char>)
 , filename(name)
 {
 	wxFileName fname(filename);
@@ -113,21 +119,15 @@ const wxString AssAttachment::GetEntryData() const {
 }
 
 void AssAttachment::Extract(wxString filename) {
-	wxFileOutputStream fp(filename);
-	if (!fp.Ok()) return;
-	fp.Write(&(*data)[0], data->size());
+	agi::io::Save(STD_STR(filename)).Get().write(&(*data)[0], data->size());
 }
 
 void AssAttachment::Import(wxString filename) {
-	// Open file and get size
-	wxFileInputStream fp(filename);
-	if (!fp.Ok()) throw "Failed opening file";
-	int size = fp.SeekI(0,wxFromEnd);
-	fp.SeekI(0,wxFromStart);
-
-	// Set size and read
-	data->resize(size);
-	fp.Read(&(*data)[0],size);
+	agi::scoped_ptr<std::istream> file(agi::io::Open(STD_STR(filename)));
+	file->seekg(0, std::ios::end);
+	data->resize(file->tellg());
+	file->seekg(0, std::ios::beg);
+	file->read(&(*data)[0], data->size());
 }
 
 wxString AssAttachment::GetFileName(bool raw) {
diff --git a/aegisub/src/ass_attachment.h b/aegisub/src/ass_attachment.h
index e9d3a83d7..4fcb670a3 100644
--- a/aegisub/src/ass_attachment.h
+++ b/aegisub/src/ass_attachment.h
@@ -45,7 +45,7 @@
 /// @brief DOCME
 class AssAttachment : public AssEntry {
 	/// Decoded file data
-	std::tr1::shared_ptr<std::vector<unsigned char> > data;
+	std::tr1::shared_ptr<std::vector<char> > data;
 
 	/// Encoded data which has been read from the script but not yet decoded
 	wxString buffer;