MySQLDump issue with a special characters
You should read about string literals in MySQL.

There you’ll learn that a backslash character is used to escape some special strings, and to have literal backslashes in your strings (as in Windows pathnames), you have to double them:

INSERT INTO test_user VALUES ('new1','C:\\newfolderone.xlsx');


The complete list of characters in need of a special treatment is at the above link. 

However, it is best to have the intermediate language deal with such problems. For instance, in PHP you would call PDO::quote; other platforms and languages provide similar facilities.