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Hello Ben S
I’m sorry this has been happening, especially with a large document where lost work can be very frustrating.
The missing com.microsoft.Word.plist file may not necessarily indicate a problem; if that preference file is not present, Word may simply be using default preferences.
First, please check the newer AutoRecovery location, because recent Word for Mac versions may use this path instead:
/Users/<username>/Library/Containers/com.Microsoft/Data/Library/Preferences/AutoRecovery
You can open it from Finder by selecting Go > Go to Folder and pasting the path.
The AutoRecovery folder is hidden, so it may not appear by browsing normally. If Word finds recovered files after a crash, save them immediately before continuing to edit.
For the crashing itself, I would suggest testing these next:
- Save a copy of the document locally on the Mac, not only in a synced/cloud folder, then test whether the crash still happens.
- Open the document and use File > Save As to create a fresh copy under a new name.
- If the document may be damaged, try Word > Preferences > General, enable Confirm file format conversion at Open, then use File > Open > Recover Text to extract the content into a new file.
- If possible, split the 400-page document into smaller sections to check whether one section, image, table, citation, or embedded object is triggering the crash.
- Test Word from a new macOS user profile or macOS Safe Mode to rule out profile-level or background-app conflicts
Feel free reply back to this post and update me on this issue, I'll be happy to help.