check the event log 
$ perl -le " $!= $^E = 22; printf qq/%d %s\n%d %s\n/, $!,$!,$^E,$^E "
22 Invalid argument
22 The device does not recognize the command

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In reply to Re: Spurious "Invalid Argument" on file open by Anonymous Monk
in thread Spurious "Invalid Argument" on file open by rovf

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