Applescript: read plist doesn't work

Hello,

In every application, there is a info.plist (in contents).

I want to read, from that plist, the value of the item "Icon File" (it's a string).

I tried this:

--selecting app

repeat

set appfile1 to (choose file with prompt "Choose an app to download the icon:")

set extention to get file type of (info for (appfile1))

if extention is "APPL" then

exit repeat

else

display dialog "Please select an app, not another file" with title "Error" buttons {"Ok"} default button "Ok"

end if

end repeat

--select plist

set appfile11 to do shell script "echo " & appfile1 & "Contents:info.plist"

--tell system events

tell application "System Events"

set p_list to property list file (appfile11)

value of property list item "Icon File" of p_list

end tell

(I tried with "of property list item "Information Property List"" and without it, because that item doesn't show up if I read the plist in 'Xcode', but it does in 'Plist Edit Pro')

Error:

error "System Events kreeg een fout: property list item \"Icon File\" of property list file \"Macintosh HD:Users:Isaiah:Downloads:UnRarX.app:Contents:Info.plist\" kan niet worden opgevraagd. " number -1728 from property list item "Icon File" of property list file "Macintosh HD:Users:Isaiah:Downloads:UnRarX.app:Contents:Info.plist"

Please help me,

Isaiah v. Hunen