why php from web broswer doesn't find a file that has special character

I need to manipulate the openldap server database file for an app feature. I noticed that on shell it can find the openldap database file olcDatabase={1}bdb.ldif. But when I run the script from web browser from a windows host, it can not find the file. So I wrote my test script as below.

When it is run from web, it can not find the file at all and escaping special characters doesn't help. I also used %3D or \x3D to replace "=" (http://ift.tt/1oDte6v), but it doesn't help either. This may be related to utf8 encoding or something like this in windows environment but i m not able to figure out how to fix this problem. Highly apprecitate any tips and solutions. Thanks a lot in advance!