Final answer:
The file extension for an Alteryx workflow is .yxmd, which is used to save and reopen Alteryx Designer workflows.
Step-by-step explanation:
The file extension for an Alteryx workflow is .yxmd.
When you save a workflow in the Alteryx data analytics platform, it is saved with the .yxmd extension. This file contains the various tools you have used, their configuration, and the workflow's structure, allowing you to reopen the workflow in Alteryx Designer at a later time to edit, run, or share with others. Being familiar with this extension allows users to better organize and identify their Alteryx workflows among other files.