Running under the debugger I get an access violation:

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Stack trace:
> 7fffffff()
ExamDiff.exe!_CoInitializeEx@8() + 0x28896 bytes
[Frames below may be incorrect and/or missing, no symbols loaded for ExamDiff.exe]
ExamDiff.exe!004a0259()
ExamDiff.exe!_CoInitializeEx@8() + 0x148ca bytes
ExamDiff.exe!_CoInitializeEx@8() + 0x1529c bytes
ExamDiff.exe!_CoInitializeEx@8() + 0x10c3f bytes
ExamDiff.exe!_CoInitializeEx@8() + 0x13d2a bytes
ExamDiff.exe!_CoInitializeEx@8() + 0x13db9 bytes
user32.dll!GetDC() + 0x6d bytes
user32.dll!GetDC() + 0x14f bytes
user32.dll!GetParent() + 0x16c bytes
user32.dll!SendMessageW() + 0x49 bytes
ExamDiff.exe!_CoInitializeEx@8() + 0x2409a bytes
ExamDiff.exe!_CoInitializeEx@8() + 0x1529c bytes
ExamDiff.exe!_CoInitializeEx@8() + 0x10c3f bytes
ExamDiff.exe!_CoInitializeEx@8() + 0x13d2a bytes
ExamDiff.exe!_CoInitializeEx@8() + 0x13db9 bytes
user32.dll!GetDC() + 0x6d bytes
user32.dll!GetDC() + 0x14f bytes
user32.dll!GetParent() + 0x16c bytes
user32.dll!SendMessageW() + 0x49 bytes
comctl32.dll!ImageList_LoadImage() + 0x198b bytes
comctl32.dll!ImageList_LoadImage() + 0x2a7ee bytes
comctl32.dll!ImageList_LoadImage() + 0x33e22 bytes
comctl32.dll!ImageList_LoadImage() + 0x36712 bytes
comctl32.dll!ImageList_LoadImage() + 0x383f3 bytes
user32.dll!GetDC() + 0x6d bytes
user32.dll!GetDC() + 0x14f bytes
user32.dll!IsWindowUnicode() + 0xa1 bytes
user32.dll!CallWindowProcW() + 0x1b bytes
ExamDiff.exe!_CoInitializeEx@8() + 0x10acf bytes
ExamDiff.exe!_CoInitializeEx@8() + 0x10c56 bytes
ExamDiff.exe!_CoInitializeEx@8() + 0x13d2a bytes
ExamDiff.exe!_CoInitializeEx@8() + 0x13db9 bytes
user32.dll!GetDC() + 0x6d bytes
user32.dll!GetDC() + 0x14f bytes
user32.dll!GetParent() + 0x16c bytes
user32.dll!SendMessageW() + 0x49 bytes
ExamDiff.exe!00437a1d()
ExamDiff.exe!00480c0f()
ExamDiff.exe!00499629()
ExamDiff.exe!00480c02()
ExamDiff.exe!004986ca()
ExamDiff.exe!_CoInitializeEx@8() + 0x13d80 bytes
ExamDiff.exe!_CoInitializeEx@8() + 0x13db9 bytes
001909f0()