[kj911]

LOLZ and XP: Partially compatible... (decompressor only.) Few case, i need EXE patching from running XP.

Unfortunately, this cannot be said about Razor. (Due to Christian's stubbornness, several people asked him to release an x86 binary in vain.) There is no 32-bit (de)compressor for it, although its memory requirement of 1.66*N (during decompression) and its limited dictionary size of 1023MB would be no problem for its use on PCs with 2.5-4GB of RAM and under 32-bit OS. It plays in the same league as DLZ in this regard. You only need x64 when packing, if the dictionary size is large.

Hint: There is an early Razor compressor, it even runs on XP, but it is not easy to compile correctly and it compresses quite well even with a 64MB fixed dictionary(?), compressing each data type to bytes exactly the same way as the RZ1.0x.x versions. The difference is 1-2%, but the unpacking code is not stable enough. (There is no multi-file or folder compression/archiver functions.)