Use the following workaround to do a Mass Find and Replace using Excel on the USER data in the CSV to a compatible format for it to be imported:
1. Open the CSV file to import into Assets.
2. Export the Users from the K1000 into an Excel format (Settings | Users | Choose Action| Export | Export to Excel)
3. Copy the Entire Column "NAME" and "LOGON" to the CSV you want to import. (Leave a few blank Columns in between the Data that is changing and the Data that is pasted in)