There is no genuine Microsoft product or update with that exact name. Possible explanations:
Microsoft’s official Office 2021 includes tools like:
There is no separate "common v90" download for Office 2021.
If the missing component is tied specifically to an Office tool: microsoftofficetoolscommonv90 download 2021
An online repair will reinstall all shared Office components, including any missing v90 dependencies.
Instead of hunting for a single file, the correct fix—and the one recommended by Microsoft—is to install the entire runtime package that contains this file.
If you tried to install Microsoft Office 2007, Office 2010, or an older standalone application (like Visio 2007 or Project 2007) on Windows 10 or Windows 11 in 2021 or later, the setup routine may fail to properly install the Visual C++ 2008 SP1 redistributable due to newer security protocols or User Account Control (UAC) restrictions. There is no genuine Microsoft product or update
No, the legitimate component is not a virus. However, fake download sites may package malware under that name. Only obtain it through Microsoft’s official redistributables.
While your file version is v9.0 (VS 2008 era), Microsoft packages the backward-compatible libraries inside the VS 2010 Tools for Office Runtime. This is the standard redistributable used to run these solutions.
Note: This runtime is included by default in newer versions of Visual Studio, but if you are on a client machine just running the software, you must install the redistributable. Microsoft’s official Office 2021 includes tools like:
Microsoft offers a dedicated tool to fix installation/removal problems for Office components.
The file Microsoft.Office.Tools.Common.v9.0.dll should now exist in your Global Assembly Cache (GAC) or in the program files folder. Usually, you do not need to interact with this file directly; simply installing the runtime fixes the program that was crashing.