MSVCP100.dll / MSVCR100.dll Missing in Nestopia UE (Legacy Win32 Builds)

If Nestopia UE stops with a message saying MSVCP100.dll or MSVCR100.dll is missing, the emulator itself is not broken and your game files are not involved. Windows is telling you that a support library those older builds rely on is not installed on your computer. This error belongs to the legacy 32-bit Windows builds — the 1.53.x line and the 1.99.0 legacy release — and the fix is a standard Microsoft package, installed once, from Microsoft.

What these files are

MSVCP100.dll and MSVCR100.dll are part of the Microsoft Visual C++ 2010 runtime libraries — shared components that programs built with Microsoft’s 2010 development tools need in order to run. Programs do not each carry a private copy; they expect the runtime to be installed on the system. The legacy Nestopia UE win32 builds were compiled with that Visual Studio 2010 toolchain, as the project’s own build instructions reflect, which is why they ask for these particular files.

Many computers already have this runtime because other older programs installed it years ago. A fresh Windows installation, or one that has never run software from that era, may simply never have received it — which is why the same emulator file can start on one PC and fail immediately on another.

The fix: install the Visual C++ 2010 redistributable (x86)

  1. Go to Microsoft’s own website and download the Microsoft Visual C++ 2010 Redistributable Package. Download it from Microsoft only — not from a DLL download site (see the warning below).
  2. Choose the x86 package. The legacy Nestopia UE builds are 32-bit programs, so they need the 32-bit runtime even on a 64-bit Windows system. Installing the x86 package on 64-bit Windows is normal and does not harm the 64-bit side of the system.
  3. Run the installer, let it finish, and restart the computer if the installer asks you to.
  4. Start Nestopia UE again. The missing-DLL message should be gone; if a different message appears, note it exactly, because it points somewhere else.

If the installer reports that the package is already present, a repair or a remove-and-reinstall of that same Microsoft package is the sensible next step, followed by a fresh copy of the emulator from our download page to rule out a damaged emulator folder. Keep the whole release package together when you extract it, rather than moving the program file on its own.

Do not download individual DLL files

Search results for a missing DLL are full of sites offering the single file on its own. Avoid them. A loose DLL from an unknown site may be the wrong version, incomplete or tampered with, it does not register the rest of the runtime the program expects, and it turns a simple, safe install into a security risk. The complete redistributable from Microsoft is free, small and is the same package the program was designed to use. For the same reason, verify any emulator download with the SHA-256 hash published on our download page, as described in our SmartScreen guide.

The modern alternative: use the 2.0.0 build

You may not need the legacy line at all. Nestopia UE 2.0.0, released on 2026-09-13, is the current release and the first to ship a native 64-bit Windows build (alongside a macOS Apple Silicon .dmg and a Linux .deb). If your computer runs 64-bit Windows — most do — the 2.0.0 Windows x86_64 build from the download page is the better long-term choice, and it does not depend on the 2010 runtime that produces this error.

The legacy builds still have their place: 1.99.0 exists for users who need the older 32-bit line, and 1.53.2 is the archived release from 2025-08-09. On an older 32-bit-only PC, the legacy line plus the Visual C++ 2010 x86 redistributable remains the working combination. Just be clear which line you are running before troubleshooting — the version is the first thing to check when any guide mentions this error, and our FAQ summarises which build suits which system.

If the error persists

  • Confirm you installed the x86 package, not only the x64 one. The 64-bit package does not provide what a 32-bit program asks for.
  • Re-run the Microsoft installer and choose its repair option if offered, then restart.
  • Extract a fresh copy of the emulator into a new folder and test there, so a mixed or damaged folder is ruled out.
  • Check that your antivirus has not quarantined part of the emulator folder. If it has, restore it only if the download’s SHA-256 hash matches the value on the download page; otherwise download again from there.
  • Write down the exact wording of any remaining error. A different DLL name means a different cause, and guessing further helps no one.

Once the runtime is installed, it stays installed — you will not need to repeat this for other programs from the same era, and the legacy Nestopia UE builds should start normally from then on. For a first-time setup after fixing the error, continue with the setup guide.

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