what filesystem in L do you have on your system?
can you make dir l: ? and tell about the filesystem let me guess you have atleast fastfilesystem and proparly a ram-handler here you need to find the one use for your cd file system AsimCDFS or CDFileSystem
another is to see how your file cd0 is can you tell devicename, handlername and unit number is very important.
devicename should be like gvpscsi.device
unit=1 if that is the id of your drive
else type the command type devs:dosdrivers/cd0
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