This is 100% reproducible for me
When I open an arbitrary txt file in swriter via double-click, the application hangs and needs to be killed.
Log shows some relocations and sometimes (but not necessarily) recurring:
(../../win32ss/user/ntuser/msgqueue.c:1271) err: MsqSendMessage timed out 2 Status 102
In case you wait long enough you'll see:
ERROR: RtlpWaitForCriticalSection at ../../sdk/lib/rtl/critical.c:172
Contrary when we open the file via the "open" button in the same dialog, it does not hang, the double-click is important to make it happen!
following only mentioned for wider context:
LibreOffice 18.104.22.168 Calc also deadlocks when opening arbitrary .xls.
Log shows also some relocations then.
Apache OpenOffice 4.1.2 also swriter and calc both deadlock when opening txt/xls.