Sorry about the trouble you are facing while saving the files with Illustrator. If I get it correctly, whenever you are trying to save files with Arabic text, it saves a temp file instead, files with English text just save normally.
In that case, I would request if you could share a few more details like:
OS and version of Illustrator
Where you are saving these files (Network Drive/ System HDD/ Shared Folder on System /External HDD)?
When did this start happening? Are there any recent changes made to your system? For example, any antivirus, system updates or web extensions installed recently.
I have windows 10 corporate plan with full adobe suit facility. We are in Medical Pharma line. We make Artworks in multiple languages as per project requirement. Antivirus cisco we are using, all system updated do regularly by our IT people. These was saving on desktop with local folder. This is facing from last 7 days, sometime says file name is too long. But when windows 10 have some limitations upto 266 characters, but Illustrator cann't handle big file name.