diff --git a/core/core-os.el b/core/core-os.el
new file mode 100644
index 000000000..f68c0d04a
--- /dev/null
+++ b/core/core-os.el
@@ -0,0 +1,11 @@
+;;; core-os.el
+
+(defun doom-open-with (&optional app-name path)
+  (error "`doom-open-with' not implemented"))
+
+(cond (IS-MAC     (require 'core-os-osx))
+      (IS-LINUX   (require 'core-os-osx))
+      (IS-WINDOWS (require 'core-os-osx)))
+
+(provide 'core-os)
+;;; core-os.el ends here