There are no available official tools for MFP. You need to use the TDD ones available here:

https://wiki.frictionalgames.com/hpl2/tools/start

Install them as said on the page, but in the MFP directory. Use version 1.3 or newer.

To make the TDD tools load MFP files properly, you will need to mod them with some custom config files:

https://www.moddb.com/addons/mfp-editor-update

Simply drag them into your MFP folder and replace all files when prompted.

Keep in mind this is work in progress and some functionality is still being restored.