What kind of .tga files? Have you tried 24-bit instead of 32-bit?
Also, are you conforming to their Archive Structure?
http://modding.companyofheroes.com/asset-pack
-
#Steam AliasWL%Streak
- 1.60583.879+9
- 2.10935.757+4
- 3.43264.871+1
- 4.302169.641+1
- 5.14851.744-1
- 6.14765.693+15
- 7.14939.793+8
- 8.401200.667+10
- 9.19565.750+8
- 10.199105.655+2