diff --git a/scripts/functions b/scripts/functions
index 9ec06936..3f7f941c 100644
--- a/scripts/functions
+++ b/scripts/functions
@@ -334,9 +334,10 @@ CT_GetFile() {
     local file="$1"
     local first_ext=""
     shift
+    # If next argument starts with a dot, then this is not an URL,
+    # and we can consider that it is a preferred extension.
     case "$1" in
-        .tar.bz2|.tar.gz|.tgz|.tar)
-            first_ext="$1"
+        .*) first_ext="$1"
             shift
             ;;
     esac