modernexecserver.dll RPC interface

version info says "Modern Execution Server". I don`t know what this means
8EC21E98-B5CE-4916-A3D6-449FA428A007 version 0.0
19 methods:

• FmMuxSrvRegisterCoreUIEndpoints
• FmMuxSrvLaunchTask
• FmMuxSrvResumeTask
• FmMuxSrvPauseTask
• FmMuxSrvCancelTask
• FmMuxSrvAbortTask
• FmMuxSrvGetTaskPid
• FmMuxSrvSetTaskDehydrationEligibility
• FmMuxSrvResolveApplicationUri
• FmMuxSrvGetActivationPolicy
• FmMuxSrvShutdown
• FmMuxSrvSetForegroundTaskInstanceId
• FmMuxSrvGenerateActivationInstanceId
• FmMuxSrvActivationPrerequisitePhase
• FmMuxSrvIsCBETask
• FmMuxSrvIsValidTaskPid
• FmMuxSrvResumePrerequisitePhase
• FmMuxSrvGetForegroundTaskInstanceId
• FmMuxSrvActivationBypass

0FC77B1A-95D8-4A2E-A0C0-CFF54237462B version 0.0
9 methods:

• FmMuxSrvRegisterFGNotificationCoreUIEndpoint
• FmMuxSrvUnRegisterFGNotificationCoreUIEndpoint
• FmMuxSrvGetForegroundProductId
• FmMuxSrvIsForegroundProductId
• FmMuxSrvGetProductIdFromProcessId
• FmMuxSrvGenerateWatsonReport
• FmMuxSrvGetProcessProductId
• FmMuxSrvDehydrateHost
• FmMuxSrvIsCallingProcessForeground
•  

B1EF227E-DFA5-421E-82BB-67A6A129C496 version 0.0
11 methods:

• FmMuxSrvIsActivationBeingDebugged
• FmMuxSrvIsForegroundActivation
• FmMuxSrvGetForegroundActivationInstanceId
• FmMuxSrvGetApplicationId
• FmMuxSrvGetPackageFamilyName
• FmMuxSrvGetPackageFullName
• FmMuxSrvGetPSMKey
• FmMuxSrvDehydrateApplication
• FmMuxSrvSetAutoDehydrateFlag
• FmMuxSrvGetAutoDehydrateFlag
• FmMuxSrvReloadSettings