REGEDIT4

[HKEY_CLASSES_ROOT\.cha]
@="chatfile"
"Content Type"="application/x-chat"

[HKEY_CLASSES_ROOT\.chat]
@="chatfile"
"Content Type"="application/x-chat"

[HKEY_CLASSES_ROOT\chatfile]
@="mIRC Chat File"

[HKEY_CLASSES_ROOT\chatfile\shell]

[HKEY_CLASSES_ROOT\chatfile\shell\DefaultIcon]
@="\"D:\\mirc\\mlink32.exe\",0"

[HKEY_CLASSES_ROOT\chatfile\shell\open]
@=""

[HKEY_CLASSES_ROOT\chatfile\shell\open\command]
@="\"C:\\mirc\\mlink32.exe\" %1"