Connect Qi SDK common Questions

1.I use Symbian Connect QI SDK to copy some files, in a Loop, from the 
Device to Desktop, manipulate them there and copy them back, in a Loop to 
the Phone. (SE P900). Copying in a blank Loop, the App chrashes. Therfore i 
can catch the Event FileCopyComplete from Scom and then continue the Program 
Flow.
I thought it was a problem with the speed of the copy Operation, e.g. i can 
only create one File Object copy them and during the Copy Operation the Loop 
creates the next File Object and tryining to copy them results in a crash.
However, with the FileCopyComplete Event it works well, but now i tried to 
copy a bigger file (about 80-90 kb) and the App crahes again..
Is there a boundary of the FileSize?

2. i don't find any way for checking of an existing file. I have to check 
where a app is installed, in ROM or at SD/Memory Card.

3. Applications build with connectQI SDK need mrouter and SCRuntime to run 
successfully on any machine. SE PC Suite comes with mrouter and in earlier 
Versions with ScRuntime but in the current Version SCRuntime is not any 
longer included, so it must installed additional.
Is Connect QI SDK obsolete? Is there an another common way to build Connect 
Apps for UIQ Devices and i don't see it?
I build the same App for S80 Phones with a Connect SDK (PC SUITE SDK) from 
Nokia and the Duration of Copy Operations is twice faster.

Thanks in Advance
Mario