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Dear VTK User

I am having trouble loading a file with the tk_GetOpenFile function. I have managed to save the required polydata, but everytime I load the same file it won't let me bring it into the already running functions within the program.

Please find the program in the uploaded files section under 'tin man'

p.s.

I also have another smaller problem in so much as I can't specify the initialfile, could someone provide and example of how to make it look for just *.txt files