Doom Builder Not Changing Format?

[CrimCuttle]

I'm attempting to switch my 'ZDoom Doom in Doom format' map into 'ZDoom Doom in Hexen format' to get the skybox options and whatnot, but it wouldn't change using the configuration.
I forced it to change using F2 and then I tried running it, but it said something like linedefs not working or something along those lines.
How do I fix this?

[Kappes Buur]

Using F2 will not properly translate all action specials. Use zwadconv.exe instead.
The easiest way is using ZWadConvGUI.

http://forum.zdoom.org/viewtopic.php?f=39&t=52726