I tested the NCE file you sent me and normally I would send you a private message, but I discovered something interesting that I thought should be posted.

I'm running Map App Ver 2.2.8.604 with a US West Coast map.
The file you sent me is called "radar30.nce".
This is what I did:
Created an "extensions" folder inside the "map" folder.
Created an "installed" folder inside the "extensions" folder.

Gathered a few NCE files:
maxstops.nce
radar30.nce
radar31.nce (copy of radar30)
radar32.nce (copy of radar30)

Placed these files in the "extensions" folder.
Ran Map App and all files asked if I wanted them installed and I said yes.

Here is the interesting part:
Only maxstops and radar30 POIs were loaded. Even though radar31 and radar32 appears in the "installed" folder they do not appear in the "mapdata/poi" folder.
This means that the file's identity is imbedded inside the NCE file and the App does not use the filename. Radar31 and Radar32 were most likely installed right on top of the original Radar30, but retains the imbedded identity. This info could be useful when troubleshooting.

Other then that interesting observation, the radar30 file loaded just fine. Keep in mind that since I'm using the US map I cannot check Brazilian POIs.