Hy wait a second i am just replying to your previous question
for 7 i may help now
But again may be no strictly needed if you install Notepad++ (link in my previous) message ,
Don't worry if NOtepad++ may look complex, you don't need to dig in the complexity but just use it as you will use ythe most simple text editor
Anyway and this will help not only to run python script:
go to Start/Control Panel/Folder options
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there click "View" tab
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almost at beginning you will see "Hidden Files and Folder" and below "Don't display hidden files and folder " UNMark that box
very last, scroll down a bit
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Uncheck "hide System files" (Ignore the warning that will pop out, you WISH that)
And even more important the option just below "hide file extension"
CLICK APPLY and then OK to exit
Now you will be able to know what the heck is in your computer, if a file is .py , .scm. jpg. or a exe or whatelse
And you will discover if the file is py, or as happen usually for Py plugin downloaded from the plugin registry (for a nasty bug in the side) it become .py.txt...in case just remove ".txt" , ignore any warning (=YES you want change file extension).
About opening py still i have no bclear why you wish open it, if you place in the right place is Gimp that will RUN the file once you click the right menu entry
Anyway as i wrote if you have Notepad ++ installed you should be able to open the file just clicking on it
If not open the more cheap MS notepad (aka block note) , and open the file from the file menu
NOTE WELL i wrote notepad NOT WORD !!
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About last question
that say that your firewell may block a component of python even if that component will not do anything dangerous, so will be better for you put Python in the Firewall WHITE-list
But if i remember well you may not care less about the warning, because that component should not be required to use python script from gimp