Reg. Document(Filename) not opening files with special Character in its name.. ?

HI,

We Have PDF files located in the server name and contains Special characters in it … like the below

ZFileName
30-0941 -20- E.pdf
30-0941 -22- D.PDF
30-0941 -80- A.PDF
B64 - ED7966 ± SI -015- OR.pdf
UAF -ADC- 10-4 - OR.pdf
UPS- CURING OVEN -01- B.PDF

The filenames with " + "is not operning up …?
Is the special characetes Allowed in Document (FileName) … field ! If the Is there any other alternative …?

Anyone can help

Regards
Dhana