File Explorer that offers the functionality of digital signature of PDF documents through the certificates issued at national level (Spain).

Features:
- File functionalities: Search, Cut, copy, paste, compress (zip), share documents and files (email, ...)
- Mutiselection of files and folders to carry out the functions of sharing, cutting, copying, deleting altogether.
- Multifirm of PDF documents. The multi-signature is activated, the PDF documents are selected and the Sign button is pressed.
- Installation of more than one certificate issued in Spain.
- Deletion of all installed certificates.
- Selection of the current certificate that will be used to sign PDF documents.
- Signature of PDF documents in one click from external file Explorer.
- Digital signature configuration:
       1- Establish the reason, contact information and location.
       2- Show or hide the signature stamp located in the upper left corner
       3- Establish a corporate logo on the digital signature stamp.
       4- Security: Set password to make the signature
- Browser configuration:
       1- View folders or hidden files
       2- Show preview of the images
       3- Sort list by alphabetical order, type or size