Fix non-existing environment variable and use native path separator
@@ -16,8 +16,8 @@ extern "C" {
// - /usr/lib/clap
//
// Windows
-// - %CommonFilesFolder%/CLAP/
-// - %LOCALAPPDATA%/Programs/Common/CLAP/
+// - %COMMONPROGRAMFILES%\CLAP
+// - %LOCALAPPDATA%\Programs\Common\CLAP
//
// MacOS
// - /Library/Audio/Plug-Ins/CLAP
