Problems with name of file on sdcard WP SL 8.1

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C#

Windows-Phone-8.1

, +

I create a file named "Products.txt" on sdCard. When I open it first time its name is "Products[1].txt", second time the name is "Products[2].txt", third time again "Product[1].txt" and so on. I don't understand why because I don't have another file with the same name. My big problem is that I want to write in it and every time I write something it creates a new one with the same problem. Someone know why the name is changed and how to solve this problem? Thanks!

What I have tried:

I tried to add try catch blocks, but it doesn't work.