GetTempFileName() causes crush

[JoderCoder]

Hello, i have an application which I am investigating the crush dump for. The application is supposed to create a tmp file under C:\DOCUME~1\<username>\LOCALS~1\Temp\

The API called is GetTempFileName()

GetTempFileName(lpPathBuffer, TEXT("NEW"), 0, szTempName);  

I made sure lpPathBuffer is correct (C:\DOCUME~1\<username>\LOCALS~1\Temp\). The function NEVER returns 0, which is supposed to mean that a unique tmp file is created under C:\DOCUME~1\<username>\LOCALS~1\Temp\. However, in the crush dump szTempName is 0x035801cf <Bad Ptr>. In a working scenario, szTempName is something like 0x00f32968 "C:\DOCUME~1\<username>\LOCALS~1\Temp\NEWE075. tmp"

Any idea why szTempName did get a bad value i.e. 0x035801cf <Bad Ptr> for the crush scenario? Any thought shared is really appreciated.