Do not support long filename??

I am not very sure that, but I really can not delete the remote files which have long filename.
My OS is Windows XP SP1a
Version: v 1.0.978
The history log follows:

DELE 05-26-03_15.46.17.131390.fqf
550 05-26-03_15.46.17.131390.fqf: Forbidden filename
DELE 05-26-03_16.39.25.1179896.fqf
550 05-26-03_16.39.25.1179896.fqf: Forbidden filename
DELE 05-26-03_15.47.12.524800.fqf
550 05-26-03_15.47.12.524800.fqf: Forbidden filename
NOOP
200 NOOP command successful.

"05-26-03_15.46.17.131390.fqf" is a file.

Thank you.

The problem is with the server. Quotes between the filename may fix the problem:

DELE "05-26-03_15.46.17.131390.fqf"