There is no context menu available for changed files in the 'Checking pending changes' window. However, there is a similar view in the 'Pending changes' tab of PlasticSCM's main window and a context menu is available there.

The thing is that the context menu enables you to view changes using a diff tool you prefer (the one set in application preferences). In the window mentioned in the topic there is no such menu at all and you can view changes only using the diff tool embedded inside that window.

Most of us in our company are used to WinMerge and we would like to continue using it with PlasticSCM. The 'Pending changes' view enables you to do that, but I think you rarely use it when managing source code changes directly from Visual Studio (which displays the discussed window).