OK. I'm a tiny step closer.
SuperLemmini will now successfully open and load all of the .lvl files that cannot be converted to .ini, albeit
as External levels only.
As far as I can tell, it isn't possible to compile a level pack from .lvl files. I have specified in levelpack.ini that the relevant levels are indeed in the .lvl rather than .ini format, but for some reason it refuses to recognise these levels - in fact, throwing up the error "
The resource styles//.ini is missing" when attempting to load them as part of a pack.
This is bizarre, since the engine is clearly capable of loading these same levels externally. There appears to be a format restriction on level packs and/or loading levels via the levelpack.ini system.
I've even tried opening the levels in the old
jLevelBuilder, to no avail. Namida suggested that this is because the levels are in
NeoLemmix-style .lvl as opposed to DOS/Windows .lvl, and so are in fact platform-dependent.
I've attached the levelpack as it currently stands, in case anyone else wants to have a look at it as well