Windows: Startup Issues for Some Third-Party Apps After Recent Updates

Microsoft has acknowledged a bug that prevents certain third-party applications from properly launching Office suites or opening specific documents, an issue that emerged after the installation of the latest Patch Tuesday updates, including KB5094126 and KB5093998 for Windows 11, and their counterparts for Windows 10, along with associated dynamic updates.

The criticality, so far not widely documented by the company, manifests in a subset of software that relies on OLE (Object Linking and Embedding) automation to interact with Office programs. The blocking mechanism occurs when a third-party application attempts to invoke an Office program or document directly from its interface. In such circumstances, the Office application may not start at all, or the requested document may remain inaccessible.

Issues with Office After the Last Patch Tuesday: You Are Not Alone

The dysfunction involves numerous components of the Microsoft Office suite, including Word, Excel, PowerPoint, Access, and other applications when invoked through the affected software. Examples of third-party programs reported by Microsoft include accounting and tax management solutions such as CCH Engagement and Workpaper Manager, practice management systems for dental offices such as Dentrix and Softdent, and the popular tool for managing references and research, Zotero. The company clarified that other software employing similar integration methods may encounter the same issues.

To understand the extent of the problem, it is essential to examine Microsoft's OLE (Object Linking and Embedding) technology. OLE is a technology that allows different applications to collaborate and share data seamlessly. Its automation function, in particular, enables one program to control another. This mechanism is crucial as it empowers third-party software to launch Microsoft Office applications, open documents, and perform specific operations automatically, eliminating the need for users to manually switch from one program to another.

Currently, Microsoft has not released a permanent solution. However, the company has confirmed that its engineers are actively working on a fix, which will be included in a future Windows update. Further details will be provided as they become available. In the meantime, Microsoft suggests a direct workaround for affected users: open the desired Office application or document directly, without going through the third-party program.