TDMS_DefragmentFile blocks some PC's

Hello

I've a problem with the TDMS_DefragmentFile function.

If I use this function then the windows 7 pc blocks while the function is running.

This problem is not on all windows 7 pc's on some pc's it works properly.

I've used the same file on different pc's.

LabWindows 2013 SP 2

TDMS file format 2.0