GetOpenFileName & OPENFILENAME lpstrFilter runtime string problem: lpstrfilter, getopenfilename, openfilename

GetOpenFileName & OPENFILENAME lpstrFilter runtime string problem

I get a char * to my function argument. It is a string that I parse to create a few strings from.
Example:
"var1,var2,1234,Text (.txt)|*.txt|Bitmap (.bmp)|*.bmp||"

I have a function that parses the strings so I end up with one :
"Text (.txt)|*.txt|Bitmap (.bmp)|*.bmp||"

So I replace the '|' with '\0' :
"Text (.txt)\0*.txt\0Bitmap (.bmp)\0*.bmp\0\0"

char filter[512];
strcpy(filter,"Text (.txt)\0*.txt\0Bitmap (.bmp)\0*.bmp\0\0 ") ;

Now it should be in the format to set my lpstrFilter:
OPENFILENAME opfn;
opfn.lpstrFilter = filter;

and try to pass it as lpstrFilter to GetOpenFileName(&opfn)

The problem is that the filter doesn't work properly. I get The First part working perfectly.
- Text (.txt)
but the other options in the filter comboBox are crazy unrecognizable characters. (2 lines of them)

How can I get this to work?

// here is the function that changes '|' to '\0'
// for(i=0;i<strlen(filters);i++)
// {
      // if(filters[i] == '|')
      // {
            // filters[i] = '\0';
      // }
// }

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GetOpenFileName & OPENFILENAME lpstrFilter runtime string problem

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