Hey, relax ..... you are at the fount of all wisdom, knowledge, peace and understanding, namely OFPEC.
What's so frustrating is that you know that it does work ... which of course it does. So we need to find out at what stage in the process its going wrong.
When I un-pbo'd the original campaign using Amalfi's un-pbo 1.5 (available in the Ed Depot) it un-pbo'd everything into a folder. In that folder was a sub-folder called Missions. And in Missions I found mission folders for all the missions, amongst other things.
Let's take that classic mission
05aAfterMontignac.Eden
If you open the folder you should find a variety of files, including mission.sqm. Open it in a text editor like Notepad or Wordpad and you should find this
version=11.000000;
class Mission
{
addOns[]={};
randomSeed=3274243.000000;
class Intel
{
briefingName="@STRCN_05a";
startWeather=0.518710;
startFog=0.256228;
forecastWeather=1.000000;
forecastFog=0.749875;
day=13.000000;
hour=5.000000;
minute=25.000000;
etc etc
If it doesn't look like this there is no point in progressing further. Get a different un-pbo utility and try again.
Now, as you know, you need to copy the Montignac folder into c:\ ....... \users\yourname\missions
Fire up OFP - version should be irrelevant - goto Mission Editor and Everon and there it should be.
If its not, go back through the process step by step and figure out where its going wrong. Then tell us and we'll try to fix it.
Stay
man