unstructured

34972816 - Matches prefix to verify presence of DOCX,PPTX,XLSX files instead of standard file names (#3959)

Matches prefix to verify presence of DOCX,PPTX,XLSX files instead of standard file names (#3959) Instead of looking for presence of `word/document.xml` , `ppt/presentation.xml` and `xl/workbook.xml` to identify DOCX,PPTX and XLSX files, we look for prefix `word/document*.xml`, `ppt/presentation*.xml` and `xl/workbook*.xml` as certain files generated from office365 has files with different names. Fixes https://github.com/Unstructured-IO/unstructured/issues/3937 --------- Co-authored-by: Yao You <theyaoyou@gmail.com>