[Paolo Ceroni]

Thank you very much for your quick answer.
I have backup copy of the program but it gives the same error.
Unfortunately I cannot share the program, it’s property of the company.
What I can do is copying the lines that – to me – seem related to the issue. As said, I need to open and read data from an Excel file. This should be done via DDE connection to that file, using a software from Tech Soft:

3210 Ddeinfo$=””
3220 IF NOT INMEM(“Ddeinit”) THEN
3230 MASS STORAGE IS “C:\GAIA\PROGRAMMI”
3240 LOADSUB ALL FROM “htb8dde.csb”
3250 END IF
3260 CALL Ddeinit(Result)

the program runs well up to line 3250. at the end of the code I can see a list of CSUBs added by line 3240:

CSUB Ddeinit(INTEGER Result)
CSUB Ddeconnect(INTEGER Channel,Service$,Topic$)
CSUB Dderequest(INTEGER Channel,Item$,Buf$,INTEGER Result)
CSUB Ddeinfo(Info$,INTEGER Result)
CSUB Ddepoke(INTEGER Channel,Item$,Poke$,INTEGER Result)
CSUB Ddeexecute(INTEGER Channel,Commd$,INTEGER Result)
CSUB Ddeclean(INTEGER Result)
CSUB Ddeterminate(INTEGER Channel,INTEGER Result)
CSUB Ddetimeout(INTEGER Newtimeout,INTEGER Result)
CSUB Dderequestl(INTEGER Channel,Item$,Buf$(*),INTEGER Result)
CSUB Ddegetlocale(INTEGER Lctype,Lcdata$,INTEGER Result)

but I cannot see any instructions there.
Thank you again in advance. and sorry for my poor comprehension of coding

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