qole, your method works, thank you for help!
I guessed that source of problem was in overflow of some storage, but couldn't imagine that size of /tmp directory is limited.
I established that, for example, for this file even 1Mb size of /tmp is enough, when without changing /tmp size only 2,5 first pictures was visible.
Of course, for bigger files will be required bigger /tmp directory.

There are still some bugs, but I think that developers of this app know about them better than I. =) They all related to not full compatibility with MS Office doc format.