diff --git a/src/app/crash/session.cpp b/src/app/crash/session.cpp
index f234149ea..827f6a6f5 100644
--- a/src/app/crash/session.cpp
+++ b/src/app/crash/session.cpp
@@ -53,7 +53,11 @@ void Session::create(base::pid pid)
 {
   m_pid = pid;
 
+#ifdef _WIN32
+  std::ofstream of(base::from_utf8(pidFilename()));
+#else
   std::ofstream of(pidFilename());
+#endif
   of << m_pid;
 }
 
diff --git a/src/app/document_exporter.cpp b/src/app/document_exporter.cpp
index 514dad5e6..6f00671db 100644
--- a/src/app/document_exporter.cpp
+++ b/src/app/document_exporter.cpp
@@ -20,6 +20,7 @@
 #include "base/convert_to.h"
 #include "base/path.h"
 #include "base/shared_ptr.h"
+#include "base/string.h"
 #include "base/unique_ptr.h"
 #include "doc/algorithm/shrink_bounds.h"
 #include "doc/cel.h"
@@ -264,7 +265,11 @@ Document* DocumentExporter::exportSheet()
   if (m_dataFilename.empty())
     osbuf = std::cout.rdbuf();
   else {
+#ifdef _WIN32
+    fos.open(base::from_utf8(m_dataFilename).c_str(), std::ios::out);
+#else
     fos.open(m_dataFilename.c_str(), std::ios::out);
+#endif
     osbuf = fos.rdbuf();
   }
   std::ostream os(osbuf);
diff --git a/src/app/res/http_loader.cpp b/src/app/res/http_loader.cpp
index 2d94be687..bf55ab3c5 100644
--- a/src/app/res/http_loader.cpp
+++ b/src/app/res/http_loader.cpp
@@ -12,10 +12,11 @@
 #include "app/res/http_loader.h"
 
 #include "base/bind.h"
-#include "base/replace_string.h"
 #include "base/fs.h"
 #include "base/path.h"
+#include "base/replace_string.h"
 #include "base/scoped_value.h"
+#include "base/string.h"
 #include "net/http_request.h"
 #include "net/http_response.h"
 
@@ -58,7 +59,11 @@ void HttpLoader::threadHttpRequest()
     base::replace_string(fn, "&", "-");
     fn = base::join_path(dir, fn);
 
+#ifdef _WIN32
+    std::ofstream output(base::from_utf8(fn).c_str());
+#else
     std::ofstream output(fn.c_str());
+#endif
     net::HttpRequest http(m_url);
     net::HttpResponse response(&output);
     http.send(response);