XLSX is well-known format for Microsoft Excel documents that was introduced by Microsoft with the release of Microsoft Office 2007. Based on structure organized according to the Open Packaging Conventions as outlined in Part 2 of the OOXML standard ECMA-376, the new format is a zip package that contains a number of XML files. The underlying structure and files can be examined by simply unzipping the .xlsx file.
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{"STEP1_PUTS":"1. Put signatures:","STEP2_SIGN":"2. Sign document and download result:","STEP3_EXIT":"Exit:","Sign_Bar_Name":"Bar codes","Sign_Bar_Title":"New Bar code","Sign_Dig_Name":"Digital Certificate Files (.pfx)","Sign_Dig_Title":"New digital signature","Sign_Hand_Name":"Hand signatures","Sign_Hand_Title":"","Sign_Image_Name":"Uploaded Images","Sign_Image_Title":"Add image signature","Sign_Qr_Name":"QR codes","Sign_Qr_Title":"New QR code","Sign_Stamp_Name":"Stamps","Sign_Stamp_Title":"","Sign_Text_Name":"Text signatures","Sign_Text_Title":"","ListPanel_Apply":"Apply","ListPanel_NoEntries":"There is no entries yet","Sign_Text_Default":"Signed","UI_Text_Click_Or_Drop":"Click [split] to open [file] [split] or drop it here","UI_Text_Certificate":"a certificate","UI_Text_Image":"an image","UI_Text_File":"a file","URL_SignDocument":"/signature/signdocument","URL_FileUpload":"/signature/upload","URL_Total":"/signature/total","MSG_FailedToUploadFile":"Failed to upload file. Reason:","MSG_SelectFileUpload":"Please select a file to upload.","MSG_SelectFileToSign":"Please select one file to sign.","MSG_UnsupportedType":"You are trying to upload file(s) of unsupported type: ","MSG_DropSelectFileToSign":"Drop or select your file to sign","AllowedExtensions":"\"xlsx\",\"xls\",\"xlsb\",\"xlsm\",\"xlt\",\"xltm\"","ImageExtensions":".bmp,.gif,.jpg,.jpeg,.png","CertificateExtensions":".pfx"}