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>In this case Yuri, there are many hundreds of PRGs and changes happen a lot. So, it's more efficient to update FXPs that a massive (or a few) large EXEs.
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>Thanks for your thoughts,
>Ken

And all those hundreds PRG or their FXPs should be distributed with the application, put into the proper client directories, your application should include these directories into the path, the client should have permission to access these directories, etc.
Otherwise one may experience problem like you described originally.