220-1102 Software Troubleshooting Practice Question
A technician enables '16-bit Application Support' in Windows Features on a 64-bit Windows 10 Pro workstation, but a legacy 16-bit application still fails to run. What is the most likely reason?
⚠ Common exam trap
Many candidates assume enabling a Windows Feature will resolve the issue, but they overlook the fundamental architectural limitation that 64-bit Windows cannot execute 16-bit code regardless of feature settings.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
64-bit Windows does not support 16-bit applications
64-bit versions of Windows, including Windows 10 Pro, do not include the Windows on Windows (WOW) 16-bit emulation layer (NTVDM). The '16-bit Application Support' feature is only available on 32-bit Windows installations; enabling it on 64-bit Windows does not install the necessary NTVDM subsystem, so 16-bit executables cannot run.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The application requires administrative privileges
Why it's wrong here
Requesting administrator rights is a common prompt for legacy software, but it is unrelated to the underlying failure. A 16-bit executable cannot be launched on 64-bit Windows because the NTVDM subsystem is missing, and no amount of elevation can create that missing component. UAC elevation only changes security context; it does not add architectural support for 16-bit instructions or DOS interrupts, so the app would still fail with the same compatibility error.
- ✓
64-bit Windows does not support 16-bit applications
Why this is correct
On x64 editions of Windows, the NTVDM and WOW16 layers are completely absent, so 16-bit applications cannot execute natively. Even if the technician enables optional legacy components from within Windows Features, those components are only available on 32-bit editions, and on 64-bit they either do not appear or have no effect. This architectural limitation is the definitive reason why the 16-bit app will not run, regardless of feature settings or account permissions.
- ✗
The application is incompatible with Windows 10 in general
Why it's wrong here
This explanation is too broad because Windows 10 is not universally hostile to 16-bit applications. The 32-bit editions of Windows 10 still include NTVDM, which can run many 16-bit DOS and Windows apps, and older Windows versions like XP also supported them. The real problem here is specifically that the technician's system is 64-bit, which removes the 16-bit support layer entirely; the issue is about CPU architecture and Windows edition bitness, not the version number of Windows.
- ✗
The user's account is not part of the Administrators group
Why it's wrong here
Membership in the Administrators group grants elevated privileges, but it cannot resurrect a missing subsystem. The application does not even reach the point where access control checks are evaluated, because the 16-bit process cannot be started without wowexec.exe or NTVDM under 64-bit Windows. Even a user with full administrative rights and UAC disabled would encounter the identical '16-bit MS-DOS Subsystem' or compatibility error, so this is not a permissions issue.
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Key term
Windows 10
Windows 10 is a personal computer operating system developed by Microsoft that combines the familiarity of Windows 7 with the modern features of Windows 8, designed to run on a wide range of devices from desktops to tablets.
Key term
Windows
Windows is a family of operating systems developed by Microsoft that manages computer hardware and software, providing a graphical user interface for users to interact with their devices.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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