MindManager 13 的文件在低版本中打不开，提示文件内容错误。
I don't know what you mea by a lower version, but...
In general newer software versions add functionality that is also stored in the maps/files created.
So it should be normal that older versios cannot read those.
However, the latest versions of MindManager use the *.MMAP format for files.
Some older versions can only read *.MMP files
There appears to be invalid XML characters in your map, which causes it to not open in both MindManager Windows and Mac.
Please open a case with our Technical Support team and attach a copy of the file and our technicians will check if it can be repaired - MindManager Support