Hi i would like to download the CSV file store in the table but i have 
problem with download

the code below is in the control, it gets the id from the URL and use 
SQLFORM.Grid to display. in the performance file column, there is a file 
link to download performance file but when i click on the file link, it 
navigate me to the next page with the hashed name file in the url and say 
404 not found.
def view_performance():
    files = db.Pass_Configuration(request.args(0, cast=int)) or 
redirect(URL('index'))
    list_performance = SQLFORM.grid(db.Pass_Configuration.id == files.id, 
maxtextlengths={'Pass_Configuration.%s' %ASSET_CONFIGURATION_ID : 256}, 
                                    user_signature=False, 
                                    create=False, 
                                    editable=False,
                                    links_placement = 'right',
                                    details=False)
    return locals()

this is the table definition in model

db.define_table( 'Pass_Configuration',  Field('PassID',                
 'reference Pass',                       label=T('Pass'),    
requires=IS_NOT_EMPTY()),
                                            Field('TargetID',              
 'reference Target',                     label=T('Target')),
                                            Field(ASSET_CONFIGURATION_ID,  
 'reference %s' %ASSET_CONFIGURATION,    label=T('%s' 
%ASSET_CONFIGURATION)),
                                            Field('PerformanceFile',        
type = 'upload',                        label=T('Performance File')),
                                            Field('PerformanceJSON',        
type = 'text',     writable=False,readable=False, label=T('Performance 
JSON')), redefine=True)

could you please help me to point out why i could not download the file 
sinc ei am new to Web2py ?

Thanks 

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