ikokeesmaat: Hi,
I SOLVED this issue. The problem was caused by the total length of the directories under which the subdirectory "Battle Isle Platinum" was installed.
"C:\Program Files (x86)\GOG Games\" didn't work (and produced the error referring to C:\DATA\WINCD), but
"C:\Program FIles (x86)\GOG G\" does work (for me).
Note that it is the total length of directory names that counts.
For instance:
"C:\Program Files (x86) GOG Games\" doesn't work, whereas
"C:\Program Files (x86) GOG G\" does work.
Since C:\Program FIles (x86)\ is the usual location for 32 bit applications on 64 bit systems, it looked like a 64 bit issue. Well, it isn't .
Hopefully this also helps others.
Iko.
You should never install games (especially older games) in program files folder in Windows Vista/7/8/8.1 in the first place. Use C:\games, C:\GOG or something instead. Saves you from lot of headaches and hair lose later.