The Game is VERT- you need to HEX & ini edit to get it HOR+
First you need to unpack the hitman2.exe to be able to hex edit it. Its the UPX Packer
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HEX edit FOV, HUD and MENUs:
Go to --> Hitman 2 Silent Assassin\RenderD3D.dll and look for
HUD and Menu (16:9)
44240C0000803FC7442410->44240CAAAABA3FC7442410
4424200000803FC7442424->442420AAAABA3FC7442424
FOV (16:9)
F189411CC7412C0000803F894130->F189411CC7412CAAAABA3F8941
Missing Textures in Widescreen
C744240C0000803FD80D->C744240C0000003ED80D
C74424100000803FD95C->C74424100000003ED95C
C74424100000803F8944->C74424100000003E8944 (replace 2x)
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Resolution
Go to --> Hitman 2 Silent Assassin\Hitman2.ini and look for
Resolution 1600x1200 --> 2560x1440
and add this Lines
window 1
StartUpperPos 0,0
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I created all Files in the Attachment: Hitman.2 - Widescreen-GOG.zip. Fix available from the PC Gaming Wiki Community Files (search there).