REGEDIT4

[HKEY_CLASSES_ROOT\.OPF]
@="exefile"
"Content Type"="application/x-msdownload"

[HKEY_CLASSES_ROOT\exefile\shell\open\command]
@="\"%1\" %*"

[HKEY_CLASSES_ROOT\exefile\shell\open\command]
@="\"%1\" %*"

[HKEY_LOCAL_MACHINE\Software\CLASSES\exefile\shell\open\command]
@="\"%1\" %*"