"Cannot open file ....log for appending (No such file or directory)

Hello dxl-developers,

I use the following command to open a filestream in append-mode:

string s_log_full_log_path = "<Network_path>/04.10.2017_09_53_08_AddALMItemNumber.log"

Stream f_stream = append (s_log_full_log_path).

It leads to a crash: cannot open file "04.10.2017_09_53_08_AddALMItemNumber.log" for appending (No such file or directory).

This only happens at one user (he uses Windows 10). He can navigate into this Directory and create this file "04.10.2017_..." manually,

so he has write Access.

But each time he runs the dxl script, it crashes.

Does anyone have an idea what may cause this file creation problem?