Password-protected PPT files fail conversion to PDF via WOPI Conversion API

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Hi everyone,

I am testing Office-to-PDF conversion using the WOPI Conversion API described here:
https://api.onlyoffice.com/docs/docs-api/using-wopi/conversion-api/

Environment:

  • onlyoffice-documentserver-de.x86_64 9.3.1-10.el7

Most files are converted successfully, including password-protected Office files I tested, but I found two password-protected .ppt files that consistently fail during conversion to PDF.

Attached sample files:

  1. pass_1234.ppt (41.5 KB)

    Password: 1234

  2. pwd111111.ppt (131 KB)
    Password: 111111

Issue:

  • Conversion fails for these two files using the Conversion API.

  • Other test files work correctly in the same environment.

Questions:

  1. Are password-protected legacy .ppt files fully supported by the Conversion API in DocumentServer 9.3.1?

  2. Is this a known issue specific to these files or to encrypted .ppt files in general?

  3. Could you help verify whether this is a bug or expected behavior?

  4. If needed, is there any workaround or configuration required for these files?

I have attached both sample files for reproduction.

Thank you.