Thanks for your attention.
I tried as you mentioned. Yes! your suggestion solved the separation of characters. In fact, I have no unwanted space between characters.
BUT, there is another problem unsolved!!!
All words are correctly converted to the PRC format but this time I see all words in wrong placed. suppose we have two words (not letter, a whole word) such as : A and B. in the source file I have (B A) that is correct. but in the output I see (A B)
Input : مشکل برنامه
output: برنامه مشکل
Now I am going to test more cases :
Left-to-right with Farsi option,
Left-to-right with English option,
Right-to-Left with Farsi option,
Right-to-Left with English option,
and again all above cases when the doc file is left-to-right (8 total cases)
Many thanks for your help