TBSOOO and PHP 5 on IIS?

I am having trouble with a TBSOoO installation on a new server which runs PHP 5 and IIS. The template comes through, but template fields are unchanged. Variables and values are definitely given. I am using the TBS Version suited for PHP 5. Read and write permissions are ok.
Could it be the ZIP binary that cannot be accessed? But in that case, surely I should get an error message?

Got it. It was the ZIP executable which was not available on windows.
If anybody has the same problem, I have modified TBSOOO to work with Alexandre Tedeschi's DUnzip2 class. While this package still requires compiled-in GZIP support, it makes TBSOOO independent from external binaries. Anybody interested, drop me a line.