If you are trying to extract meshes from GR2 format units (native to SH5), you should use TDW's GR2 editor/viewer/extractor/importer. This is the link to its thread:
http://www.subsim.com/radioroom/show...06#post1757906
Please note that the program is still in its alpha stage, and its author has removed download links from the official thread until he manages to iron out some bugs. Nonetheless, you can download a couple of earlier versions of the utility from the following thread which also contain some useful tutorials:
http://www.subsim.com/radioroom/show...47#post1942247
They got limited functionality, but should be more than enough for what you want to do