Attached is the 2016 Edition of the 1.02 editor for Original War. The upgrades it has is basically that it works with the latest OWP's.
To use it you need to extract data1.owp to your Original War directory (As it uses the files in the directory rather than data1.owp). Note that any map made which has SAIL commands that were not found in 1.02 will cause the editor to crash if you run them. The games missions (You need to extract them from the Disk2 folder) should work with the editor as they shouldn't use any modern sail commands. Also you will need to set your monitor to 16Bit colour as it won't do it for you.
Note: The editor has had minor changes to make it work but its basically the same as the original. You may want to change its name so you don't overwrite the current version of the editor.