I get this inside chrome's console:
Creating Application Cache with manifest mydomain.com/game/offline.appcache
Application Cache Checking event
chrome-extension://hdokiejnpimakedhajhdlcegeplioahd/onloadwff.js:608 : CS -> BG : FAILED rebuildcontext
chrome-extension://hdokiejnpimakedhajhdlcegeplioahd/onloadwff.js:609 : CS -> BG : FAILED rebuildcontext
chrome-extension://hdokiejnpimakedhajhdlcegeplioahd/onloadwff.js:6012 : CS -> BG : FAILED rebuildcontext
Application Cache Error event: Manifest fetch failed (404) mydomain.com/game/offline.appcache
---
My mime types are IIS's default ones.
EDIT: You were totally right, I added .appcache and .ogg to them and now it's working fine! Thanks!
Thanks!