We have a small php application that we need to run under our episerver site. When we test setting it up under a regular asp.net site it works as expected. But when we add the application under our episerver site, the php file is routed through asp.net and we get a asp.net error message Compiler Error Message: CS1519: Invalid token ',' in class, struct, or interface member declaration.

IIS version is 7.5

Any tips on what can be causing this and how to solve it?