Steven,

Store the file name to a variable first and then use that to evaluate it.

lcFile = AllT(pdm_var.ReleasedPDFDir)+AllT(pdm_var.current_drawing_no)+AllT(pdm_var.current_drawing_rev)+".pdf"

If File(lcFile) = .T. Then

is_file_open_ds = FDate(lcFile,1)

Else

is_file_open_ds = {} 

EndIf