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I have had similar problems with NewBB2 with this regard in that the file upload OK, it is a vliad file on the server, but when it's clicked I get 'The file may be corrupt...' errors.
I'm not sure if this is an XOOPS problem or to do with the way indioviduals have their browser and other software configured and linked together.
The way I get round the problm with NewBB2 is I suggest people right click the link, 'save as' somewhere on their PC and then 'Open'. It's almost as quick, give or take a couple of seconds. I cannot confess to actually experiencing this with WF-Sections though - not used it for that yet.