InDesign CS2 file not open in InDesing CS6

Hi All,

I am having hundreds of CS2 version file. Most of the files are opening in CS6. but some files are not open in CS6 but it is opening in CS2. what is the problem?

Code:

for(var cnt=0;cnt<InputFiles.length;cnt++){

    app.scriptPreferences.userInteractionLevel = UserInteractionLevels.neverInteract;

    app.open(File(InputFiles[cnt]));

    app.scriptPreferences.userInteractionLevel = UserInteractionLevels.neverInteract;

.

.

.

.

}

Error:

while i try to open manual then it shows

if i click OK then it is open.

how to do it script? Help me

Thanks in Advance,

Mahesh