You dont need to patch SH5.exe with a 4gb patch. Yes the program is already large address aware.
But if you use a 32bit operating system. You will need to tell your operating system to use more than 2gb.
From the readme file of SH5.
Quote:
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5. Miscellaneous
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5.2 Enabling 3GB switch on Windows XP or Windows Vista
Advanced users may know that the virtual address space of processes and applications is still limited to 2 GB unless the /3GB switch is used. Activating this option in Windows greatly enhance Silent Hunter 5 performance.
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WARNING.
I take no responsibility for loss of data or damage to your pc.
Read the whole thread before trying this as a simple typo can mean your pc will no longer boot. And only do this if you feel confident and understand what you are doing.
Enabling 3GB switch on Windows XP