diff --git a/BizHawk.Client.EmuHawk/FileLoader.cs b/BizHawk.Client.EmuHawk/FileLoader.cs
index 2071de742d..0009646fb4 100644
--- a/BizHawk.Client.EmuHawk/FileLoader.cs
+++ b/BizHawk.Client.EmuHawk/FileLoader.cs
@@ -55,7 +55,7 @@ namespace BizHawk.Client.EmuHawk
 				};
 				}
 
-				return new[] { ".NES", ".FDS", ".UNF", ".SMS", ".GG", ".SG", ".GB", ".GBC", ".GBA", ".PCE", ".SGX", ".BIN", ".SMD", ".GEN", ".MD", ".SMC", ".SFC", ".A26", ".A78", ".LNX", ".COL", ".ROM", ".M3U", ".CUE", ".CCD", ".SGB", ".Z64", ".V64", ".N64", ".WS", ".WSC", ".XML", ".DSK", ".DO", ".PO", ".PSF", ".MINIPSF", ".NSF", ".32X" };
+				return new[] { ".NES", ".FDS", ".UNF", ".SMS", ".GG", ".SG", ".GB", ".GBC", ".GBA", ".PCE", ".SGX", ".BIN", ".SMD", ".GEN", ".MD", ".SMC", ".SFC", ".A26", ".A78", ".LNX", ".COL", ".ROM", ".M3U", ".CUE", ".CCD", ".SGB", ".Z64", ".V64", ".N64", ".WS", ".WSC", ".XML", ".DSK", ".DO", ".PO", ".PSF", ".MINIPSF", ".NSF", ".32X", ".MDS" };
 			}
 		}
 
diff --git a/BizHawk.Client.EmuHawk/MainForm.cs b/BizHawk.Client.EmuHawk/MainForm.cs
index 4fda942f31..170dbb2322 100644
--- a/BizHawk.Client.EmuHawk/MainForm.cs
+++ b/BizHawk.Client.EmuHawk/MainForm.cs
@@ -2083,7 +2083,7 @@ namespace BizHawk.Client.EmuHawk
 						"NES", "*.nes;*.fds;*.unf;*.nsf;%ARCH%",
 						"Super NES", "*.smc;*.sfc;*.xml;%ARCH%",
 						"Master System", "*.sms;*.gg;*.sg;%ARCH%",
-						"PC Engine", "*.pce;*.sgx;*.cue;*.ccd;%ARCH%",
+						"PC Engine", "*.pce;*.sgx;*.cue;*.ccd;*.mds;%ARCH%",
 						"TI-83", "*.rom;%ARCH%",
 						"Archive Files", "%ARCH%",
 						"Savestate", "*.state",
@@ -2109,17 +2109,17 @@ namespace BizHawk.Client.EmuHawk
 				}
 
 				return FormatFilter(
-					"Rom Files", "*.nes;*.fds;*.unf;*.sms;*.gg;*.sg;*.gb;*.gbc;*.gba;*.pce;*.sgx;*.bin;*.smd;*.gen;*.md;*.32x;*.smc;*.sfc;*.a26;*.a78;*.lnx;*.col;*.int;*.rom;*.m3u;*.cue;*.ccd;*.sgb;*.z64;*.v64;*.n64;*.ws;*.wsc;*.xml;*.dsk;*.do;*.po;*.psf;*.ngp;*.ngc;*.prg;*.d64;*.g64;*.minipsf;*.nsf;%ARCH%",
-					"Disc Images", "*.cue;*.ccd;*.m3u",
+					"Rom Files", "*.nes;*.fds;*.unf;*.sms;*.gg;*.sg;*.gb;*.gbc;*.gba;*.pce;*.sgx;*.bin;*.smd;*.gen;*.md;*.32x;*.smc;*.sfc;*.a26;*.a78;*.lnx;*.col;*.int;*.rom;*.m3u;*.cue;*.ccd;*.mds;*.sgb;*.z64;*.v64;*.n64;*.ws;*.wsc;*.xml;*.dsk;*.do;*.po;*.psf;*.ngp;*.ngc;*.prg;*.d64;*.g64;*.minipsf;*.nsf;%ARCH%",
+					"Disc Images", "*.cue;*.ccd;*.mds;*.m3u",
 					"NES", "*.nes;*.fds;*.unf;*.nsf;%ARCH%",
 					"Super NES", "*.smc;*.sfc;*.xml;%ARCH%",
-					"PlayStation", "*.cue;*.ccd;*.m3u",
+					"PlayStation", "*.cue;*.ccd;*.mds;*.m3u",
 					"PSF Playstation Sound File", "*.psf;*.minipsf",
 					"Nintendo 64", "*.z64;*.v64;*.n64",
 					"Gameboy", "*.gb;*.gbc;*.sgb;%ARCH%",
 					"Gameboy Advance", "*.gba;%ARCH%",
 					"Master System", "*.sms;*.gg;*.sg;%ARCH%",
-					"PC Engine", "*.pce;*.sgx;*.cue;*.ccd;%ARCH%",
+					"PC Engine", "*.pce;*.sgx;*.cue;*.ccd;*.mds;%ARCH%",
 					"Atari 2600", "*.a26;%ARCH%",
 					"Atari 7800", "*.a78;%ARCH%",
 					"Atari Lynx", "*.lnx;%ARCH%",