Hi! My level is called "Warriors Extreme" (a dummy test level name).
Here are the different files in the level:
WarriorsExtreme.wmb
WarriorsExtreme.wmp
WarriorsExtreme.$$w
WarriorsExtreme.bak
WarriorsExtreme.$$M
WarriorsExtreme.wdl
WarriorsExtreme.raw
WarriorsExtreme.wed


However, I did find duplicate file just as listed above except that there is sa space after "Warrior".
Maybe I'm not clear on something, but I don't see any " gid01.wdl" or " display00.wdl " anywhere in the folder. I deleted these duplicates and just kept the files above. However, the WED compiler still shouted <EXTREME.WMB>: Can't open file and <EXTREME.WMB>: Can't open level.

Why?

Thanks very much for your reply, Futurulus !
Want_to_learn

PS, I messed up on the <EXTREME.SED>. I looked at it later and found that it was actually <EXTREME.WED> .
Sorry about that!