First: "C:\Program Files\GStudio6\001_Project_test_mysql" is no valid path syntax -> "C:\\Program Files\\GStudio6\\001_Project_test_mysql" NOTE: Always use double-backslashes!
Second, the actual better way is to place all your plugins into your Project work folder and make plugindir: plugindir = ".";
"Sometimes JCL reminds me of Notch, but more competent" ~ Kiyaku