ASPack is an advanced Win32 executable file compressor, capable of reducing the file size of 32-bit Windows programs by as much as 70% (ASPack compression ratio improves upon the industry-standard ZIP file format by as much as 10-20%). ASPack makes programs and libraries smaller, and decrease load times across networks, and download times from the internet; it also protects programs against reverse engineering by non-professional hackers. Programs compressed with ASPack are self-contained and run exactly as before, with no runtime performance penalties.

• advanced processing of executable files (EXE, DLL, OCX)
• encoding and compression of program code, data, and resources
• completely transparent, self-contained operation with long filename support
• fast decompression routines deliver better performance than competing products
• integrates directly into Windows as a shell extension for ease of use
• full Windows 95/NT4.0/98/ME/2000/XP/2003 compatibility. Protected applications are also compatible with Windows Vista

• significant reduction in executable file sizes, averaging from 40-70%
• decrease load times across networks, and download times from the internet
• embedded Windows applications require significantly less storage space
• protects resources and code against peeking, disassemblers and decompilers
• no runtime royalties for distributing compressed programs
• compatible with executables created by Microsoft Visual C++, Visual Basic, Inprise (Borland) Delphi and C++ Builder, and other Win32 compilers