Issue with opening PDF file from FilePro

[Fairlight]

The honourable and venerable Bob Rasmussen spoke thus:
> > 2.  How do I check if a file can be opened in R/W mode in FP?
> 
> I don't know this one.

The OPEN() function returns a negative number upon failure.

::rs = open("c:/some/file.pdf","rw"):
:rs lt "0":'some error handling here, could not open:

mark->
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