diff --git a/config/emulators/pc-9800.conf b/config/emulators/pc-9800.conf
index d864ed60f1..b40cd73ee9 100644
--- a/config/emulators/pc-9800.conf
+++ b/config/emulators/pc-9800.conf
@@ -4,7 +4,7 @@ SYSTEM_MANUFACTURER="NEC"
 SYSTEM_RELEASE="1983"
 SYSTEM_HARDWARE="computer"
 SYSTEM_PATH="/storage/roms/pc98"
-SYSTEM_EXTENSION=".d98 .zip .fdi .fdd .2hd .tfd .d88 .hdm .xdf .dup .hdi .thd .nhd .hdd .hdn"
+SYSTEM_EXTENSION=".d98 .zip .fdi .fdd .2hd .tfd .d88 .hdm .xdf .dup .hdi .thd .nhd .hdd .hdn .cmd"
 SYSTEM_PLATFORM="pc98"
 SYSTEM_THEME="pc98"
 SYSTEM_WIKI_PATH="pc98"