The model looks as if it may have been a cdsSpice syntax model (based on the filename, and the backslashes, and the &).

spp is obsolete, and is not necessary for standard SPICE models, which can be read directly by spectre.

However, there's a separate utility to convert spectreS models to spectre. In the icfb CIW, you can do Tools->Conversion Tool Box, and then there is "Spectre Models from SpectreS". This corresponds to the utility "modelTrans" in <ICinstDir>/tools/dfII/bin - which you give a directory full of spectreS .m models, and specify the ".scs" file you want it to create from these.

Regards,

Andrew.