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OnlyOffice converts legacy binary Office uploads (.xls/.doc/.ppt) into OOXML (.xlsx/.docx/.pptx) on the server. UploadToFolderReplacing matched by the exact stem|ext via FindFilesByDedupKey, so a repeated `oo dav upload FOLDER f.xls --replace` never found the stored f.xlsx and appended a second file (live: ids 3799+3887, 3800+3888). - EquivalentUploadExt / FindFilesByStemExt: match by stem with a legacy↔OOXML extension equivalence, so .xls finds the saved .xlsx. - planUploadReplacement: pick the surviving file and the redundant duplicate ids for a replacing upload. - UploadToFolderReplacing updates the existing file in place (UpdateFile, stable id, no delete window), removes extra duplicates, and falls back to conversion-aware delete + upload when the portal rejects the update. - AssertNoFileConflict (--no-replace) uses the same conversion-aware matching so a .xls upload conflicts with an existing .xlsx. - Offline tests cover the matcher, the plan and the repeated-.xls regression; pdf/xlsx behaviour unchanged.