DOCX is Microsoft Word's native file format designed for offline processing with features that may not directly translate to web-based editors like Google Docs. You don't typically "open" a DOCX within Google Docs itself. Instead, you upload the file to Google Drive, prompting Google Docs to automatically convert it into its own editable web format. This conversion process, not a direct opening, is necessary due to the different underlying technologies.

For instance, you might upload a DOCX resume received via email to your Drive to edit it collaboratively online with a career advisor. Alternatively, a team member could share a DOCX marketing proposal through Drive, allowing everyone to comment and revise simultaneously in their browsers after conversion.

The conversion enables seamless cloud collaboration but may occasionally cause minor formatting discrepancies, such as misaligned tables or font changes, since complex DOCX layouts are re-interpreted. This limitation is inherent to translating between distinct formats. However, future enhancements focus on improving import fidelity while maintaining Docs' accessibility and real-time features that drive cloud innovation.