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SYS DLL
Not possible

Convert SYS to DLL

Can you convert SYS to DLL?
Verified by Adam B.· reviewed by FE Editorial ·updated Jul 14, 2026
QUICK ANSWER
Is it possible to convert SYS to DLL?
No - not a direct conversion.

Both formats use the Windows PE container, but a .sys driver runs in ring 0 calling kernel-only APIs while a .dll runs in ring 3 in user space. The code would need to be rewritten from scratch for a different runtime - no tool performs this conversion.

No direct path
Also to DLL: FS · JUK · NUPKG

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Tested on macOS, Windows & Linux
Last verified Nov 2026

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Why convert SYS to DLL?

A .sys file is a kernel-mode device driver linked against the Windows kernel (ntoskrnl) and HAL, loaded directly by the OS. A .dll is a user-mode shared library loaded into ordinary processes. These are different execution contexts with incompatible APIs and security models; renaming or repackaging a .sys as a .dll produces a binary that Windows will reject.

How to convert SYS to DLL

Dependency Walker FREE

Open the .sys in Dependency Walker (read-only) to inspect its import table and check whether the driver package includes a companion user-mode .dll as the intended interface.

PE-bear FREE

Open the .sys in PE-bear to examine its headers, imports, exports, and digital signature without any file conversion.

About these formats

.SYS Windows Driver File

A .sys file on modern Windows is almost always a device driver - kernel code that lets Windows communicate with hardware such as a GPU, network adapter, or storage controller. You do not…

Open .SYS details →
.DLL Dynamic Link Library

A DLL (Dynamic Link Library) is a Windows library file holding compiled code that programs load while they run, so it is not something you open by double-clicking. If an app reports a DLL…

Open .DLL details →

Quality & what to watch

  • Both .sys and .dll use the PE container ('MZ' header), but the PE subsystem field marks a driver as kernel-mode; renaming the file does not change this.
  • A kernel-mode driver renamed to .dll will not load as a user-mode library - Windows checks the PE subsystem field and rejects it.
  • If you need driver functionality in user-mode code, look for the companion .dll the hardware vendor ships alongside the .sys file.

Frequently asked questions

Can I rename a `.sys` to `.dll` and load it?
No - Windows checks the PE subsystem field; a kernel-mode driver renamed to .dll will not load as a user-mode library.
Why do `.sys` and `.dll` look similar in a hex editor?
Both use the PE container format starting with 'MZ'; the difference is in the subsystem flag and the kernel APIs the driver code links against.
Is there any tool that converts a `.sys` driver to a `.dll`?
No legitimate tool does this - the operation requires rewriting code for a different runtime and API set, not a file format change.