Posts from The map stopped launching in the map editor. (Again.)
500 MB? This poor game with a 40 MB map starts crashing with every other save. It definitely needs to have most of the files moved into a separate .pak file and stored in the data folder. The "read-only" checkbox can be unchecked by right-clicking on the archive, opening "properties," and looking at the bottom of the window that opens.
well, then we'll have to resort to restoration work.
go to the game's root folder/Editor/H5MMods
and find the folder with your map inside. Restore the map using the files from it.
So, can you extract the files from the archive or not?
And place them in another newly created map?