Building custom solutions that extend, automate, and integrate Microsoft 365 apps.
ms-word:, ms-excel:, and ms-powerpoint: are not designed to open the app to a generic home page. They are Office URI schemes for opening a specific document or template.
Supported patterns include:
- View a document:
ms-word:ofv|u|https://contoso.com/document.docx - Edit a document:
ms-excel:ofe|u|https://contoso.com/workbook.xlsx - Abbreviated form for opening a document:
ms-word:https://contoso.com/document.docx
These schemes require an http or https document URI as the command argument. The abbreviated form also implies opening a resource, not launching Word, Excel, or PowerPoint to a blank start screen.
On Windows, apps launched by URI schemes are handled by the registered app for that scheme, but an app cannot generally force a different launch behavior than what the scheme supports. For Office, the documented behavior is document-based open commands such as ofv and ofe.
If the goal is to open the Office app itself without a file, that behavior is not described for these URI schemes.