Some antivirus are accusing of infection, but it can be a false positive since it's a modified apk. Kaspersky says it's clean, so I've installed the HD one and tested with Example Short 29.976. It didn't work, so I've uninstalled it. Unless OP explains what is happening, I suggest skipping these apks.
P.S.: I tried linking to the Virus Total results but XDA won't let me post because I'm new on the foruns.