To disable an IFilter based on the extension you can use the command line option:
-config:IgnoreIFilterExt:+=csv
For example:
C:\Program Files\Mythicsoft\FileLocator Pro\FileLocatorPro.exe -config:IgnoreIFilterExt:+=csv
If in future you'd like to re-enable the IFilter use:
-config:IgnoreIFilterExt:-=csv
Note: This feature requires build 3405 or higher.