Decompress generic AIF files
If a compressed AIF files is loaded which is not decompressed by a module handling Service_UKCompression R0 = 0, such as UnsqueezeAIF FileSwitch runs the decompressor within the executable before calling Service_UKCompression R0 = 1 to allow the decompressed executable to be patched.
Tested by patching privileged instructions out of Unixlib (RISC OS GCC Port) allowing executables to run entirely in user mode.