mfc80u.dll: download the file and fix the error

32-bit (x86) Microsoft Visual C++ 2005 Scanned by antivirus

mfc80u.dll is a file of Microsoft Visual C++ 2005, the runtime library that a great many games and programs need to run. Its official description: “MFCDLL Shared Library - Retail Version”, by Microsoft Corporation.

If it is missing or damaged, Windows displays for example: “The program can't start because mfc80u.dll is missing from your computer.” Two methods can fix the error, below.

Method 1 · quick · about 1 minute

Download only mfc80u.dll

Ideal if only this file is reported missing: you replace a single file, without reinstalling anything.

⇓ Download mfc80u.dll .zip file: the DLL + its instructions · downloaded 4,547 times

Version: 8.00.50727.42
Architecture: 32-bit (x86)
Size: 1.08 MB
Publisher: Microsoft Corporation

Then:

Extract mfc80u.dll from the zip file and copy it to the folder of the program showing the error (where its .exe file is).
Still getting the error? Copy it to C:\Windows\SysWOW64 (64-bit Windows) or C:\Windows\System32 (32-bit Windows), then restart.

SHA-256: e3b1dadbdb2ac2c7d51d2fd0e4e1c34767235904ae9fcb980de3414f2a5594b9 · Check on VirusTotal · Product: Microsoft® Visual Studio® 2005

Method 2 ·complete · official method · 5 to 10 minutes

Reinstall Microsoft Visual C++ 2005

Microsoft still offers the Microsoft Visual C++ 2005 package (an older version, still required by many games). It restores mfc80u.dll and the files of the same family.

Official Microsoft page of the Visual C++ packages

On the Microsoft page, download the Visual C++ 2005 package in its x86 version, and also x64 if your Windows is 64-bit.
Run them, then restart your computer. Already installed? Settings › Apps › the 2005 package › Modify › Repair.

Complete guide: Visual C++ errors (msvcp, msvcr, vcruntime)

Error messages related to mfc80u.dll

The program can't start because mfc80u.dll is missing.
Error loading mfc80u.dll. The specified module could not be found.
Failed to load mfc80u.dll

Why does this error occur?

Microsoft Visual C++ 2005 is not installed: new computer, reinstalled Windows, or a program that does not install its own prerequisites.
The file was deleted or damaged: another program was uninstalled, an overly aggressive cleanup, an antivirus.
Wrong architecture: a 32-bit program cannot use the 64-bit version of the DLL, and vice versa.

Files of the same family (Microsoft Visual C++ 2005)

mfc80.dll msvcp80.dll msvcr80.dll

Frequently asked questions

Is mfc80u.dll a virus?

No: it is a legitimate Microsoft file. Only be wary of a copy found outside C:\Windows or a program’s folder; you can compare its SHA-256 fingerprint with the one shown on this page.

Should I install the 32-bit or the 64-bit version?

On 64-bit Windows, install both: a 32-bit game needs the x86 version, even on 64-bit Windows. On 32-bit Windows, only the x86 version can be installed.