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I have actually had errors with other rpg maker games such as Bitch Family on the Beach. Now that you say this the errors are  starting to make sense.

Currently this is about as much as I can report, I just remember one day I started to have the "can open this but not while this is open and vice versa" but I never put the pieces together until now.  I will try to experiment to see if I can get any more errors to report with more screenshots.

Edit: as of testing with BFotB the same thing occurs with the "profile error".

I just found how to open the page that says nw_elf.dll. I installed the Winrar version and extracted the game within the Winrar application and attempted to open cattle castle 1 while cattle castle 2 was open (also did it with BFotB) which yielded this image. Upon further testing this occurs regardless of whether any rpg maker games are open.

Edit: This can likely be due to my own error in not being experienced in using WinRar.