Don’t risk your device for a fake file. Instead, play Mortal Kombat: Unchained via UMD or digital store (still available on PS3/PSP transfer), or pick up MKX on Steam/PS4 when it’s on sale. Real gaming > risky downloads.
Most highly compressed files come in .rar or .zip formats. You will need software like WinRAR (on PC) or ZArchiver (on Android) to extract the ISO file. Mortal Kombat X Psp Iso Highly Compressed BETTER