Files

How can I compress a file (e.g: Install.EXE to Install.EX_) et decompress a file (Install.EX_ to Install.EXE) like a setup program?

may be you can use makecab.exe and extract.exe.

• makecab.exe - Create cabinet file(s).
• extract.exe - Decompress cabinet file(s).

You can refer to this Thread

or you can use Compress.exe and Expand.exe.

• Compress.exe - Crompress file and replace the last character of the extension to "_".
• Expand.exe - Decompress the file(s).