Believe me, I was there in Help before posting my question
Did you try to follow the Help, open the frx as a table exclusively and type the sys(1037,1) from the VFP command window? If so, how did you do it exactly?

>From the VFP Help File:
>
>All three report-related SYS(1037,) variants require access to a cursor or open table with the same format as a report (.frx) or label (.lbx) definition file. The report must be selected as a cursor or opened as a table before you call the function, and Visual FoxPro requires the report table to be opened exclusively. Otherwise, an error occurs when you call the function. For more information about the structure of report and label tables, see Table Structures of Table Files (.dbc, .frx, .lbx, .mnx, .pjx, .scx, .vcx).