/etc/wicd/encryption/templates/wep-passphrase is in wicd-daemon 1.7.4+tb2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16  | name = WEP (Passphrase)
author = Adam Blackburn
version = 2
require passphrase *Passphrase
optional key_index *Key_Index
protected passphrase *Passphrase
-----
ctrl_interface=/var/run/wpa_supplicant
network={
       ssid="$_ESSID"
       scan_ssid=$_SCAN
       key_mgmt=NONE
       wep_key$_KEY_INDEX="$_PASSPHRASE"
       wep_tx_keyidx=$_KEY_INDEX
       priority=5
}
 |