UPXPR101 is a dedicated patcher for UPX version 1.01. It will not
work on any other version. It has been tested on UPX 1.01 compressed
PE EXE files produced by MASM in 32 bit and one compiler and works
correctly on both.

It patches the EXE header so that the the decompression option does
not work. It is aimed at forcing a hacker to manually reconstruct
a compressed file before they can modify or infect it. It tests if
the file is a normal compressed EXE from UPX 1.01 and will not
patch the EXE file if the header is not correct.
