Hmm... did you rename the .exe for MioMap correctly? I ask because you will have to rename the MioMap.exe according to Osprey's directions for your device. If that still doesn't work, then my next question would be what software did your c520 come with? I ask because Israel is known to alter and even change the software on Mio devices. Some people get them with Destinator software, others with MioMap 2008, others with even something else.
Look here:
[Please Register or Login to download file] and play close attention to what Osprey says in steps 4a, 4b, and 4c. Actually you might just want to read the whole readme file. You might have to try different namings of the MioMap.exe until you find one that works. I am sure one of them will. If you tried them all and still nothing then we have to figure out what software your device came with and see if we can figure out why none of the names worked.