The embedded excel (xlsx) when inserted on its own (unlike with chart) is getting converted to ".bin". Note that only extension differs otherwise its an excel file only. There is no loss of user experience in editing the file in MS Word.
The similar case is also exists when power point is inserted on it's own.
Steps to reproduce:
1. Open the attached file in LO
2. Export to DOCX format.
3. Observe the [Content_Types].xml. The .xlsx extension is getting changed to .bin
The embedded excel (xlsx) when inserted on its own (unlike with chart) is getting converted to ".bin".
The embedded excel (xlsx) when inserted on its own (unlike with chart) should have the extension ".xlsx" as it is.
Ravindra Vidhate committed a patch related to this issue.
It has been pushed to "master":
fdo#77759 : Embedded excel getting renamed to binary object.
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.