I am sorry to to bump this topic - please forgive me. The MIC files can be played back very nicely, just in_cube seems to have problems detecting the loop points and for example 083.MIC can only play like 20 seconds and it loops - for comparison I could send over an Xbox 360 line-in rip if that might help checking on these files. Even disabling loop doesn't really help :(
MIC support has not been deleted, it's just that the MIC file are not real MIC file (as the one found in some sets) but a concatenation of MIB+MIH file ...