The OutSystems Forge is a repository of reusable, open code modules, connectors, and UI components to help speed up app delivery time.
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result for tag 
"Clientend Validation"
File Extension Validation Client Side
Salman Ansari
Using this plugin you can validate any type of file extension also you can add your custom extension as well very easy way that will automatically validate by the plugin
Latest version
1.0.0  (O11)
Latest release
21 Dec 2018
Also available for 10
FIle Extension
Validate FIle Jquery
Clientend Validation