[kapteeni]

Thank you all but could now anyone tell me where to find original map_c ? I'm not confident of SFS extractor .. is there any d/l link for map_c of slowakia anywhere?

If you are not done anything with you map_c, it can't be that. Maybe some files are just corrupted and you might need to reinstall. Have you tried different load.ini?
Are all the rivers like that?
If you need to use SFS exctractor,, you find slovakia map at maps file 15 (IIRC)
kapteeni