address of pcap file

hello experts,

i wanted to know what part of source code contains the file pointer which contains path to pcap file when u try to open a pcap file in wireshark . like for example: when i click file/open file_dlg_open_cb is called then you browse the menu for pcap file now i wanted to know what part of code stores this address or path to pcap file.

regards, sangamesh patil