BUG #5979: postgres service cannot be started if database is located in NAS

The following bug has been logged online:

Bug reference:      5979
Logged by:          qintao
Email address:      qintao@huaweisymantec.com
PostgreSQL version: 8.4.7
Operating system:   windows server 2008
Description:        postgres service cannot be started if database is
located in NAS
Details:

steps to reproduce
1. Share a directory (say \data) from a NAS
2. map the shared directory to a Windows server 2008 R2 host to be a network
drive (say Z:)
3. install postgresql to the Windows Server 2008 R2 with the database as
z:\db\.
4. try to start the postgresql service from service.msc
  It's failed with a log in the event viewer:
postgres cannot access the server configuration file
"C:/symbollink/postgresql.conf": No such file or directory

5. start a Command Prompt, execute the below cmd:
C:/Program Files (x86)/PostgreSQL/8.4/bin/pg_ctl.exe start -N
"postgresql-8.4" -D "C:/symbollink" -w

the service can be started.