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Simply strip the first 512 bytes:

Select your MMC card from the section as the Source. (Note: Do not select it as a logical drive letter).

For modern systems, the "S7 61" naming is obsolete. Siemens recommends:

The term refers to specialized utility tools designed to extract data from these images and remove S7 block passwords. Here is everything you need to know about managing these files. What is an S7 MMC Image?

Most unlocking tools scan the binary offset where Siemens stores the S7-300 password. The tool will display the password in plain text or Hex.