MItem object properties

Name	Default value	Description
in		Start position inside the item in seconds
out		End position inside the item in seconds
loop	false	Loops a playback of the item
stop_in	false	Stops a playlist at the start of the item. Possible values: true, false, duration in seconds
stop_out	false	Stops a playlist at the end of the item. Possible values: true, false, duration in seconds
pause_in	false	Pauses a playlist at the first frame of the item. Possible values: true, false, duration in seconds
pause_out	false	Pauses a playlist at the last frame of the item. Possible values: true, false, duration in seconds

These properties could be set with PropsSet method:

(pFile as IMProps).PropsSet("loop", "true");

except for "in" and "out" properties, they should be set as the params of the PlaylistAdd method:

MItem pFile;
m_objPlaylist.PlaylistAdd(null, openMediaFile.FileNames[i], "in=10", ref nIndex, out pFile);