Replace never takes, save data never highlights.

[GoogleCodeExporter]

What steps will reproduce the problem?
1. load myp file
2. extract dds from myp, optimize dds
3. attempt to replace original in myp with new dds

What is the expected output? What do you see instead?
expect new file to replace old one in myp, activation of the save data button 
as well, instead nothing happens and the save data icon is never highlighted, 
always greyed out. 

What version of the product are you using? On what operating system?
version 2.6 on windows 7 ultimate x64

Please provide any additional information below.

This is a game file I wanted to optimize myself by lowering the size of the dds 
images contained within the myp. After optimization I wished to replace the 
original dds with the smaller optimized version, but it doesn't seem to take. 
not sure why. 

Original issue reported on code.google.com by davethew...@gmail.com on 16 May 2013 at 3:06

[GoogleCodeExporter]

I got it to replace the file, however, it saves the MYP larger than the 
original and the game cannot load MYP, causing game to stall. 

the game I am attempting to optimize is Swtor. Textures can be extracted, 
optimized, but when replacing the old ones in the myp the myp becomes corrupt 
it appears. 

Original comment by davethew...@gmail.com on 16 May 2013 at 3:14