Here is a little "guide":
Open file db_countries.lua located in fc2\Scripts\Database and edit with Notepad++ editor.
Search this code e9dd44e3-9aa5-4055-84c4-6bf1d128148b
you will find this:
-- cnt_unit("{e9dd44e3-9aa5-4055-84c4-6bf1d128148b}", "C-130", {
-- color_scheme("{897c8a9d-ce80-49eb-8c98-c5d2e6930347}", "RAF Standart"),
-- }),
Delete the slashes and should looks like this:
cnt_unit("{e9dd44e3-9aa5-4055-84c4-6bf1d128148b}", "C-130", {
color_scheme("{897c8a9d-ce80-49eb-8c98-c5d2e6930347}", "RAF Standart"),
}),
Then when reads "C-130" change to "BAE Harrier"
Should look like this:
cnt_unit("{e9dd44e3-9aa5-4055-84c4-6bf1d128148b}", "BAE Harrier", {
color_scheme("{897c8a9d-ce80-49eb-8c98-c5d2e6930347}", "RAF Standart"),
}),
Save and close.-
Now open file db_units_planes.lua located in the same folder. Search this:
BAE_Harrier.lua
you will find this:
--plane_file("planes\\BAE_Harrier.lua");
the same as before, delete slashes:
plane_file("planes\\BAE_Harrier.lua");
Now the harrier will appear when you select UK. Remember that is only AI, it is not flyable.
PS: If you want you can also download and overwrite the attached file and put into folder fc2\Scripts\Database\planes (first made a back up of the original file). In the attached file the payload is corrected and added drop tanks to increase range. BAE_Harrier.lua