Bad behavior to create ZIP file

Hello
I have some problem with the creation of ZIP files with the WD XII

ResCreate = zipCreate("MyArchive", "C:\Temp\xbackup.zip")
IF ResCreate = 0 THEN
ResAddDir = zipAddDirectory("MyArchive","C:\temp", True, zipDrive)
NbrFileRes = zipNbFile("MyArchive")
END
// close zipfile
zipClose("MyArchive")

Info("NbrFileRes + " files found ")


the code above works with some conditions like:

1) does not add to the ZIP some files that start with the letter X

2) does not create zip file if case change the name "C:\Temp\xbackup.zip" to "C:\Tempbackup.zip"

3) zipMsgErreur does not works


Someone could help me with some information, please?

correction of step 2

2) does not create zip file if case change the name "C:\Temp\xbackup.zip" to "C:\Temp\backup.zip"

thank you again