Font name length limitation...

Hello all,
I have a serious problem related with .PFB font files. Is there any relation between font name length; I checked and if font name length is more than 30 characters I am getting an error that "the requested file C:\....\....Pfm,C:\....\....Pfb was not a valid font file". Although I am using the same way to install all fonts.

Please help me and give me any solution. Please let me know if there any limitation with windows XP, or its a limitation of Type 1 fonts.

Thanks in advance and pardon my English.
Thanks........