For now try setting up without OAW, and using the DirSet Picker from the link on this web page: DirSet Picker Page
Download the DirSet Picker utility from the first link on the page and install it.
For now, do not download any of the scenarios such as Desert Air War from the links (pictures) further down the page.
If you run the installer in your EAW directory it will set you up quickly, and give you full access to your 1.28E install.
It is probably worth an explanation at this point.
When EAW runs it looks for files it needs in the root folder. If it cannot find them there it gets the default ones from the CDF files.
OAW copies files from folders in the OAW folder, and pastes them into the root folder for EAW to use.
In the development of the 1.28 series we added new routines, and one of the key ones is the "Dir.Set" system.
If the 1.28E exe finds a file named "Dir.Set" in the root folder it reads it.
The "Dir.Set" file contains a list of folders that EAW can look in for the files it needs. This means that there is no need for files to be copied and pasted into the root folder by OAW, so much of what OAW does is no longer needed.
The DirSet Picker lists the files in the "DirSets" folder for selection:
That's the extensive list on my PC with a lot of test stuff in it. If you install it there will be only one file which is "ETO01" - you can download more later and the names will be added automatically when you install them.
If you select it by double clicking it will read the file named "ETO01" copy it, but paste it into the root folder as "Dir.Set".
EAW will use it, and the stuff in the "ETO_01" folder which you already have installed when you installed 1.28E.
It gives you access to four plane sets which include some multiskin squadrons, and five seasonal terrains. 1.28E automatically picks the terrain from the mission date.
Once you get this set up and you get your head around using it you can download and install more scenarios from that page. They are all set up with the correct size screen and menu files.
After that we can look at OAW again if you still want to. The 1.28E version is set up for expert users to actually create their own plane sets.