I'm using APP SDK 5.5 to make an exporter plug-in.
I want to let the user choose the extension of the output file by changing the extension in output name.
How can I do that? The SDK guide and example seems not helping at all.
You can implement exSelQueryExportFileExtension. There, based on the parameters, the plug-in can specify the file extension. You could add a parameter, perhaps a radio button, for the user to choose file extension. Or you may wish to automatically set the file extension based on a combination of parameters.