diff --git a/romsel_aktheme/arm9/source/main.cpp b/romsel_aktheme/arm9/source/main.cpp
index 18bd37aaa0..bc42dee6b0 100644
--- a/romsel_aktheme/arm9/source/main.cpp
+++ b/romsel_aktheme/arm9/source/main.cpp
@@ -1297,7 +1297,7 @@ int akTheme(void) {
 				".sc", // Sega SC-3000
 				".sms", // Sega Master System
 				".gg", // Sega Game Gear
-				".gen", ".md", // Sega Mega Drive/Genesis
+				".gen", // Sega Genesis
 				".smc", ".sfc", // SNES
 				".ws", ".wsc", // WonderSwan
 				".ngp", ".ngc", // Neo Geo Pocket
@@ -1331,6 +1331,10 @@ int akTheme(void) {
 				}
 			}
 
+			if (!ms().secondaryDevice) {
+				extensionList.emplace_back(".md"); // Sega Mega Drive
+			}
+
 			if (memcmp(io_dldi_data->friendlyName, "DSTWO(Slot-1)", 0xD) == 0) {
 				extensionList.emplace_back(".plg"); // DSTWO Plugin
 			}
diff --git a/romsel_dsimenutheme/arm9/source/main.cpp b/romsel_dsimenutheme/arm9/source/main.cpp
index 78b1d85225..e0a09957db 100644
--- a/romsel_dsimenutheme/arm9/source/main.cpp
+++ b/romsel_dsimenutheme/arm9/source/main.cpp
@@ -1236,7 +1236,7 @@ int dsiMenuTheme(void) {
 			".sc", // Sega SC-3000
 			".sms", // Sega Master System
 			".gg", // Sega Game Gear
-			".gen", ".md", // Sega Mega Drive/Genesis
+			".gen", // Genesis
 			".smc", ".sfc", // SNES
 			".ws", ".wsc", // WonderSwan
 			".ngp", ".ngc", // Neo Geo Pocket
@@ -1270,6 +1270,10 @@ int dsiMenuTheme(void) {
 			}
 		}
 
+		if (!ms().secondaryDevice) {
+			extensionList.emplace_back(".md"); // Sega Mega Drive
+		}
+
 		if (memcmp(io_dldi_data->friendlyName, "DSTWO(Slot-1)", 0xD) == 0) {
 			extensionList.emplace_back(".plg"); // DSTWO Plugin
 		}
diff --git a/romsel_r4theme/arm9/source/main.cpp b/romsel_r4theme/arm9/source/main.cpp
index 9cde606b7c..56b86ecbb6 100644
--- a/romsel_r4theme/arm9/source/main.cpp
+++ b/romsel_r4theme/arm9/source/main.cpp
@@ -1448,7 +1448,7 @@ int r4Theme(void) {
 				".sc", // Sega SC-3000
 				".sms", // Sega Master System
 				".gg", // Sega Game Gear
-				".gen", ".md", // Sega Mega Drive/Genesis
+				".gen", // Genesis
 				".smc", ".sfc", // SNES
 				".ws", ".wsc", // WonderSwan
 				".ngp", ".ngc", // Neo Geo Pocket
@@ -1482,6 +1482,10 @@ int r4Theme(void) {
 				}
 			}
 
+			if (!ms().secondaryDevice) {
+				extensionList.emplace_back(".md"); // Sega Mega Drive
+			}
+
 			if (memcmp(io_dldi_data->friendlyName, "DSTWO(Slot-1)", 0xD) == 0) {
 				extensionList.emplace_back(".plg"); // DSTWO Plugin
 			}