Make a batch,
client_up.bat, adjust to your need:
net use Y: \\192.168.160.1\share1 /user:username password
net use Z: \\192.168.160.1\share2
Where
client is the name of the config file.
Make another batch, down.bat:
net use /delete Y:
net use /delete Z:
Place both in config folder of OpenVPN.
Add to
client.ovpn:
script-security 2
down "c:\\Users\\<USERNAME>\\OpenVPN\\config\\down.bat"
or
script-security 2
down "c:\\Program Files\\OpenVPN\\config\\down.bat"
depending where your config file is.