RE: Error 9/004

2 things.

1st one: Are you sure the 9/004 occurs on the OPEN of "...filename.dat"? Couldn't it happen on another file?

2nd one: For diagnostic purposes, could you hardcode the assignation of "...filename.dat" instead of using the 'STRING w-directory  ...  filename.dat" into w-registration'?  This would allow to ascertain this sporadic 9/004 RTS error occurs because of this?  

Regards

Yvon