3 files changed, 15 insertions, 0 deletions
diff --git a/src/lib/config.h b/src/lib/config.h
index e25cb06da..29511b1fe 100644
--- a/src/lib/config.h
+++ b/src/lib/config.h
@@ -377,6 +377,7 @@ public:
 		NAG_INITIAL_SETUP,
 		NAG_IMPORT_DECRYPTION_CHAIN,
 		NAG_DELETE_DKDM,
+		NAG_32_ON_64,
 		NAG_COUNT
 	};
 
diff --git a/src/lib/cross.cc b/src/lib/cross.cc
index 171bf2c81..a7fb298cb 100644
--- a/src/lib/cross.cc
+++ b/src/lib/cross.cc
@@ -501,3 +501,16 @@ command_and_read (string cmd)
 
 	return "";
 }
+
+/** @return true if this process is a 32-bit one running on a 64-bit-capable OS */
+bool
+running_32_on_64 ()
+{
+#ifdef DCPOMATIC_WINDOWS
+	BOOL p;
+	IsWow64Process (GetCurrentProcess(), &p);
+	return p;
+#endif
+	/* XXX: assuming nobody does this on Linux / OS X */
+	return false;
+}
diff --git a/src/lib/cross.h b/src/lib/cross.h
index 06e198e99..2e8b8e429 100644
--- a/src/lib/cross.h
+++ b/src/lib/cross.h
@@ -57,6 +57,7 @@ extern uint64_t thread_id ();
 extern int avio_open_boost (AVIOContext** s, boost::filesystem::path file, int flags);
 extern boost::filesystem::path home_directory ();
 extern std::string command_and_read (std::string cmd);
+extern bool running_32_on_64 ();
 
 /** @class Waker
  *  @brief A class which tries to keep the computer awake on various operating systems.