For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Connectify Hotspot - Connectify Me hotspot is a PC app that turns your computer into a Wi-Fi hotspot.
Dropbox - Online Sync and File Sharing
Virtual Router Plus - Download Virtual Router Plus Windows Wifi Hotspot for free.
Google Drive - Access and sync your files anywhere
Baidu WiFi Hotspot - Turn your PC into a hotspot for mobile devices.
Mega - Secure File Storage and collaboration