REC Studio 4 - Reverse Engineering Compiler



Last update:
September 24, 2015


Read the License for important information regarding the use of Rec Studio.

Rec Studio 4 Downloads


Windows Icon   Rec Studio 4.1 for Windows XP/Vista/7 (best support - GUI+CLI - updated: September 19, 2015)
Linux Icon   Rec Studio 4.1 for Ubuntu Linux 11   RecStudioLinuz.tgz (good support - GUI+CLI - updated September 24, 2015)
MacOS Icon   Rec Studio 4 for Mac OS X 10.6   RecStudioMac.tgz (weakest support - GUI+CLI - updated May 25, 2012)

Note: The command line versions (CLI) implement only the following usage:

    RecCLI binary_file result.c

The 'result.c' file is created in the directory '../output'.


These files include the executable, required run-time libraries, support files such as type definitions files for many Windows and Linux APIs etc.
Simply download and unzip the files in a directory of your choice. There is no installer, nothing is changed in your registry. The program RecStudio4 can be run from the extracted bin directory.

Refer to the how to use page for instructions on using the decompiler.


Change history

Sep. 19, 2015Updated disassembler to udis 1.7.2. More aggressive type detection. Better handling of partial registers (e.g. RAX -> EAX -> AX -> AL). Improved x86_64 register definitions. Added several APIs to support files. Improved navigation to prev/next function in the UI.
Jun. 2, 2014Fixed crash with huge number of _t variables. Fixed type detection in truncating assignments. Fixed recognition of memcpy sequences in Windows.
Jan. 14, 2014Added detection of unicode strings. Improved code structuring.
Nov. 20, 2012Fixed definition of entry points in signature files. Recognition of PlayStation 1 binary files, and addition of PS1 system call signature files. Improved support for some MIPS instructions.
Oct. 20, 2012Significantly reduced memory used and significantly increased decompilation speed. Major improvements and fixes in code structuring, and fixed several bugs.
Aug. 29, 2012Fixed decoding of IMUL d,a,# instruction.
Aug. 25, 2012Function detection from .dymsym and .got symbols. Added MIPSLE support package.
May 25, 2012Better recognition of parameters from symbolic info. Added gcc C++ support file for C++ exceptions. Improved user interface. Added GUI version for Mac.
May 10, 2012Fixed switch() detection. Fixed loading PowerPC MachO files. Significantly speeded up Linux version.
Apr. 24, 2012Fixed memory leak and divide by zero during constant expr. evaluation. Added loading 32-bit x86 MachO binaries and 64-bit CLI on Windows.
Apr. 15, 2012Show line number and name local variables from -g info if present in ELF. Show location of local variables.
Apr. 9, 2012Improved code structuring and symbol detection in ELF.
Apr. 6, 2012Fixed memory leak, endless loop, crashes
Mar. 19, 2012Added command line version for Linux

Rec Studio 2 Downloads

The old Rec Studio 2 is still available for download at the following links.
RecStudio for Windows 98 :
REC 1.6 for Linux : for Red Hat 7.1
REC 1.6 for Windows 95 :  
REC 1.6 for Solaris SPARC : rec16sp.tar.Z (tar+compress)
REC 1.5f for Solaris i386 : rec15fsi.taz (gzip+tar) (zip format)
REC 1.5d for SunOS : rec15ds4.taz (gzip+tar format)
(Files are from 120 to 500 kbyte. Each file contains the REC executable, prototype files for Linux and Windows, and a 386 example executable).

You can also download just the prototype files.

These files contain the types and function declarations for several system calls. When a prototype file is specified in the types: command of a .cmd file, or in the proto.lst file, REC will read the symbolic information from that file and use it to infer the number and type of local variables and function parameters.

Type files:

Linux + Windows type files (140k) or recsupp.taz (gzip+tar format)
Linux only type files (18k) recsuppl.taz (gzip+tar format)
Windows only type files (120k)

Due to copyright restrictions, the Windows prototype files are only available in binary form.

The MIPS disassembler source is also available.

From version 2.1, RecStudio uses the disassembler included in the Netwide Assembler package (version 0.98.39). The project to build the ia32 disassembler as a DLL is available here. No other portions of NASM are used in RecStudio. The Netwide Assembler can be downloaded from
At this time the other disassemblers are still statically linked in the RecStudio executable, although eventually they'll be made available as shared libraries.

Copyright 1997 - 2015 Backer Street Software - All rights reserved.

Last updated: June 2, 2014