diff --git a/DIST/with-mdc.deploy b/DIST/with-mdc.deploy
index 72e271a..850c797 100644
--- a/DIST/with-mdc.deploy
+++ b/DIST/with-mdc.deploy
@@ -518,7 +518,7 @@ C:\Src\ciderpress\Release\CiderPress.exe
 C:\Src\ciderpress\Release\CiderPress.exe
 "%1"
 TRUE
-.dsk
+.sdk
 Disk Image (CiderPress)
 C:\Src\ciderpress\Release\CiderPress.exe
 3