procedure containing FND_FILE.PUT(OUTPUT) export excel file with Arabic Characters as ?????

 while using a procedure with FND_file package. this procedure was supposed to read data from database and export it to excel file. It does returns data with arabic characters but while exporting the arabic characters are being exported as ??

1. We have a concurrent program on EBS that calls a customized stored package on the database

2. In this customized stored package we are calling the FND_FILE.PUT procedure in a cursor loop that has columns concatenated to each other containing Arabic characters 

3.Test Case: We run the request  with EXCEL output , and we got the results with question marks characters instead of Arabic characters “??????????????”