By default, all file names upload to the site in the case in which you created them. For consistency, you might want to force all of your filenames to upper case or lower case when you upload the files. Certain servers require filenames in all lower case.
To force upper or lower case filenames.
Display the Site Manager and view the Site Properties.
Click the Actions tab.
In the When uploading, apply this rule to files and folder names box, click one of the following:
Force lower case - Change all uploaded file names to lower-case letters.
Force upper case - Change all uploaded file names to upper-case letters (all capitals).
Click Connect or OK