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Compiling...
Harbour 3.2.0dev (r1506171039)
Copyright (c) 1999-2015, http://harbour-project.org/
Compiling 'tutor02.prg' and generating preprocessed output to 'tutor02.ppo'...
Lines 4261, Functions/Procedures 1
Generating C source output to 'tutor02.c'... Done.
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23918 for x64
Copyright (C) Microsoft Corporation. All rights reserved.

tutor02.c
Microsoft (R) Windows (R) Resource Compiler Version 10.0.10011.16384
Copyright (C) Microsoft Corporation. All rights reserved.

hbpp.lib(ppcore.obj) : error LNK2001: unresolved external symbol __iob_func
FiveH64.lib(HARBOUR.obj) : error LNK2001: unresolved external symbol __iob_func
hbvm.lib(hvmall.obj) : error LNK2001: unresolved external symbol __iob_func
hbcplr.lib(hbcomp.obj) : error LNK2001: unresolved external symbol __iob_func
png.lib(pngerror.obj) : error LNK2001: unresolved external symbol __iob_func
tutor02.exe : fatal error LNK1120: 1 unresolved externals
* Linking errors *

Sr. Antonio,

────────────────────────────────────────────────────────────────────────────┐
│ FWH 64 for Harbour 14.08 (MSVC++) Aug.2014 Harbour development power │▄
│ (c) FiveTech, 1993-2014 for Microsoft Windows 9X/NT/200X/ME/XP/Vista/7/8 │█
└────────────────────────────────────────────────────────────────────────────┘█
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Compiling...
Harbour 3.2.0dev (r1603082110)
Copyright (c) 1999-2016, http://harbour-project.org/
Compiling 'testdlg.prg' and generating preprocessed output to 'testdlg.ppo'...
Lines 4261, Functions/Procedures 2
Generating C source output to 'testdlg.c'... Done.
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23918 for x64
Copyright (C) Microsoft Corporation. All rights reserved.

testdlg.c
FiveH64.lib(HARBOUR.obj) : error LNK2019: unresolved external symbol __iob_func referenced in function HB_FUN_FREOPEN_STDERR
FiveHC64.lib(FWPNG.obj) : error LNK2019: unresolved external symbol png_init_io referenced in function save_png_to_file
testdlg.exe : fatal error LNK1120: 2 unresolved externals
* Linking errors *

Estas usando una versión de FWH que no está compilada con el mismo compilador de C que estás usando

Necesitas: FWH 16.03 + VSC2015 (Visual Studio Community 2015)

obrigado