File names changed from windows to Solaris

we have developed few files in windows platform and we have given the file names like
home_new.php,
testing.gif,
home_welcome.gif
home_about_us.html, etc. etc.

now we have copied all the windows files into unix machine. the
unix has converted all the above files something like
hom_00_new.php,
tes01_g.gif,
hom_01_wel.gif, etc etc.

so we have to change the above file names one by one. it is quite
difficult to do that as you know.

my questions are : why it has changed the file names?
how do we change file names as it like windows platform?

thanx in advance

How are you getting the files to the Unix system? Is it via Samba (windows file sharing) by any chance?