Missing Event Id when creating report xperf -i *.etl -o *.csv file

Hello

I cannot see Event Id column when I process my.etl file to csv form (etl is gothered using xperf in user mode, Admin rights):

   xperf -i my.etl -o my.csv -a dumper

in the output I can see rows with MYPROVIDER as following:

   UnknownEvent/Crimson,  TimeStamp,     Process Name ( PID),   ThreadID, CPU,                             ProviderId,     Id,   Task, Opcode, Version, Channel, Level,            Keyword, UserDataLength
   InvalidEvent/Crimson,  TimeStamp,     Process Name ( PID),   ThreadID, CPU,                             ProviderId,     Id,   Task, Opcode, Version, Channel, Level,            Keyword, UserDataLength
MYPROVIDER//Begin,  TimeStamp,     Process Name ( PID),   ThreadID, CPU, etw:ActivityId, etw:Related ActivityId, etw:UserSid, etw:SessionId

I checked if EventIds are embedded in my.etl.file and they are in:

   xperf -i my.etl -a eventmetadata

Provider {34f354cd-ae54-4cf8-82d4-5c2ed9076f9c}, Id 10, Version 0: No metadata found.
Provider {34f354cd-ae54-4cf8-82d4-5c2ed9076f9c}, Id 11, Version 0: No metadata found.

Additionally I opened my.etl in EventViewer (under Windows7) and this tool displays EventId.

So what is the problem with converting using xperf.exe?