Sonstiges "protool" Error OM TD/OP: simatic-op is on a write-protected

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hello everyone.


Please help.
I have a program for the machine written on protool and Strp7, When I want to open it to add changes to it, it gives me the error
open object 734:26 OM TD/OP: simatic-op is on a write-protected medium.
please tell me, How can I overcome this problem?

"Unexpected file format" Attached images.


Thank you for your help.