..that sound bad. Please try the following steps:
1) Please rename the Atari-Archi.ini (e.g. Atari-Archiv-ini.old), which is located in same directory as the executable, and start again.
If the error occurs once again please send me the ini-file.
2) Yes, the Atari-Archiv try to use the folder "Users\..\AppData\Local\Temp" for temporary files. The temp folder is deleted at start and at the end of the program.
You can change the folder in the ini file. Please change the entry e.g. "TempPath=D:\Temp" and create the folder "D:\Temp".
I hope this help...
NOTE: When importing a lot or big zipped files the best way is to end the program after soon and to start again. This will free the memory and delete the internal cache of the program, too.