Please help
This happens after I press engage..
Was working fine till todays patch.

"unable to start game client: %1 is not a valid win32 application"

Fixed it!

had to...
delete.. .patch folder // cache folder // exes.hogg // gameclient.exe // all the .dlls in the folder gameclient was in and repatched.. it was about 45mb total.

For other people finding this thread, you should just have to wipe the exes.hogg and gameclient (the DLLs don't hurt). I wouldn't delete the cache folder, since that will trigger a shader recompile that can take a while.

Well I have renamed exes.hogg and gameclient.exe by adding the suffix .old to each, I then restart the launcher with a force verify and I am still getting the unable to start game client: %1 is not a valid win32 application. I have also made sure that gameclient .exe is checked to run as administrator as well as the launcher.

This is a Win7 64bit OS. It was running fine until the patch this week. Then I started getting corrupted hogg crashes. I renamed the bins.hogg file and then forced verify, and it let me get in the game for all of about 2 minutes, then I started crashed out again with the corrupted hogg error. Since then I have not been able to get back in the game with this error at the launcher, or crashes during the force verify.

VEry frustrating.

those solutions didnt work

PROBLEM:
----------
After clicking Engage I received this error:
"Unable to start game client: %1 is not a valid Win32 application."

SOLUTION:
----------
I did as Code Ranger said to do:

1. I renamed the following files by adding ".old" to the end of each.

-C:\Users\Public\Games\Cryptic Studios\Star Trek Online\Live\GameClient.exe
-C:\Users\Public\Games\Cryptic Studios\Star Trek Online\Live\piggs\exes.hogg

2. Restarted the "Star Trek Online.exe" (C:\Users\Public\Games\Cryptic Studios\Star Trek Online.exe)

3. The patch automatically downloaded.

4. I clicked on Engage and it worked fine.

Thanks CodeRanger.

They ever actually going to fix this? Personally, I'm tired of renaming files and patching every day.