diff --git a/BizHawk.MultiClient/MainForm.cs b/BizHawk.MultiClient/MainForm.cs
index d228abe14d..7365341f31 100644
--- a/BizHawk.MultiClient/MainForm.cs
+++ b/BizHawk.MultiClient/MainForm.cs
@@ -3489,7 +3489,7 @@ namespace BizHawk.MultiClient
 			else
 			{
 				ofd.Filter = FormatFilter(
-					"Rom Files", "*.nes;*.fds;*.sms;*.gg;*.sg;*.gb;*.gbc;*.pce;*.sgx;*.bin;*.smd;*.gen;*.md;*.smc;*.sfc;*.a26;*.col;*.rom;*.cue;%ARCH%",
+					"Rom Files", "*.nes;*.fds;*.sms;*.gg;*.sg;*.gb;*.gbc;*.pce;*.sgx;*.bin;*.smd;*.gen;*.md;*.smc;*.sfc;*.a26;*.a78;*.col;*.rom;*.cue;%ARCH%",
 					"Disc Images", "*.cue",
 					"NES", "*.nes;*.fds;%ARCH%",
 					"Super NES", "*.smc;*.sfc;%ARCH%",
@@ -3497,6 +3497,7 @@ namespace BizHawk.MultiClient
 					"Master System", "*.sms;*.gg;*.sg;%ARCH%",
 					"PC Engine", "*.pce;*.sgx;*.cue;%ARCH%",
 					"Atari 2600", "*.a26;%ARCH%",
+					"Atari 7800", "*.a78;%ARCH%",
 					"Colecovision", "*.col;%ARCH%",
 					"TI-83", "*.rom;%ARCH%",
 					"Archive Files", "%ARCH%",
diff --git a/VersionInfo.cs b/VersionInfo.cs
index cd942d41ae..9bb1ef18a1 100644
--- a/VersionInfo.cs
+++ b/VersionInfo.cs
@@ -1,4 +1,4 @@
 static class VersionInfo
 {
-	public const string MAINVERSION = "1.3.0";
+	public const string MAINVERSION = "1.4.0";
 }