I think you mentioned in another post that you are developing a version of TextMaker for the Android OS... Did that happen?
Yes but it's not finised yet: http://www.softmaker.com/forum/viewforum.php?f=191
And second, does it have the same problems (i.e., memory errors, inability to work on large files, etc)? And third, will it run on an Android tablet?
It will run on android tablets and should not have any problems with larger files. You can try out the Beta if you want:
Windows Mobile was heavily restricted in the way applications were allowed to allocate memory. What good is a 256 MByte device, if a single application may only use 32 MBytes for its own data? Android thankfully has no such restrictions in native code.