mygrid.properties is a configuration file for Taverna 1.x that includes the HTTP proxy configuration and a list of services that is to be populated in the Available Processors panel. It is located in the conf/ directory of the Taverna startup directory.
On Windows, the Taverna startup directory is C:\Program Files\Taverna Workbench x.y.z or C:\Program Files(x86)\Taverna Workbench x.y.z. Look for mygrid.properties inside the conf\ directory.
To locate mygrid.propertieson a Mac, right click on the Taverna application, select Show Package Contents, switch to Column view, and navigate down through Contents/Resources/Java/conf. Right click on mygrid.properties to Open with… -> Other and select your favourite text editor, say TextEdit.
On Linux, the conf folder is located under the unzipped Taverna installation folder.
