On December 16, 2014, WPS Office 2014 for Windows, build 9.1.0.4932, was released as a subscription model for a monthly charge of US$3 for some features. The free version provided basic features and supported Microsoft Office .doc, .xls, and .ppt file formats. Premium paid versions provided full compatibility for Microsoft Office files. Officially only the paid 2014 version supported saving files in .docx, .xlsx, and .pptx formats, but, actually, the free version also supported these formats (as had the 2013 free version).