Error trapping non-existent?

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Malice
 #1
FileType is a good way to check a file beforehand, this will report on whether a file is a folder, a file or doesn't exist.

Also, check the handle value (memory address) it will equal zero if no data is loaded... something like this:

file=OpenFile("File.txt")

If file<>0
ReadLine(file)
Else
Print "No File to Read"
EndIf


By the way... Do you have the Debug mode enabled on the IDE?