Problem with fin.zup

Periodically (time in 2-3 weeks) corrupts a file fin.zup.If I open it in text editor it is empty,hex editor also shows only zeros. BUT file size remains same - 52K. Reinstallation OS (Windows NT 4.0 sp6) nothing changes. At other users everything is all right. Version Navision client 2.60.B

well throw it away and let the user make his settings again. this will create a new zup. You might want to follow this thread: http://www.mbsonline.org/forum/topic.asp?TOPIC_ID=11022