SumatraPDF: Open PDFs inside .p7m files

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New in the SumatraPDF pre-release builds:

Open PDFs inside .p7m files

SumatraPDF opens PDF documents wrapped in digitally signed .p7m files (#5618).
More: changes from May 21, 2026 and the full changelog.
#SumatraPDF #release notes
Oct 13 2026

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