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I have modified a file with another program and try to correct the checksum with WinOLS, but no correction is done.
At some checksum, especially for TDIs, it is necessary that all checksums in the original file are ok.
Only in that case all blocks are found. If the modification is done with another program,
a WinOLS project must be created and the original file imported.
Then the modified file can be imported as a version into this project.
Now all checksum blocks will be found correctly.