What is File Structure Validation engine?

File Structure Validation (FSV) is a module that inspects a file against its own format specification, enumerates every object the file contains, and blocks the file when its structure violate policy. FSV does not modify files. It returns a verdict and a detailed report; the original bytes are passed through unchanged or rejected outright.

FSV is built on the file-parsing technology behind Deep CDR, which gives it deep structural awareness across a wide range of formats — but it applies that awareness to a different decision: is this file well-formed and permitted? rather than what must be removed from this file?

Supported formats (Total 166)

Family	File types
Adobe	pdf, ai, ait
Microsoft Office Word	doc, docm, docx, dot, dotm, dotx, xml-docx
Microsoft Office Excel	xls, xlsb, xlsm, xlsx, xlt, xltm, xltx, xlam, xml-xls
Microsoft Office PowerPoint	ppt, pptm, pptx, pot, potm, potx, pps, ppsm, ppsx, ppam, sldm, sldx, xml-pptx
Visio	vdx, vsdm, vsdx, vssm, vssx, vstm, vstx, vsx, vtx
Microsoft Project	mpp
Microsoft PowerBI	pbix
OneNote	one
Open Document	odg, odp, ods, odt, otp, ots, ott
Hancom	cell, hwp, hwpx, hwt, show
Ichitaro	jhd, jtd, jtdc
DocuWorks (Windows only)	xdw, xbd, xct
RTF / Text	rtf, txt, log
Markup and data	bml, csv, har, hta, html, ics, jnlp, json, lyrx, mpd, rdf, tds, tsv, ttml, twb, vcf, vcs, xml, zei
Image	apng, bmp, cur, dcm, emf, emz, gif, heic, ico, jpg, jpx, mng, nef, png, svg, tga, tiff, tiff64, wdp, webp, wmf, wsq
Audio	aac, acm, aiff, bw64, bwf, mp3, ogg, opus, rf64, vtxt, w64, wav
Video	avi, flv, m2ts, m4a, mov, mp4, mpeg, mts, mxf, webm, wma, wmv
CAD and 3D	dwg, dwt, dws, dxf, dwf, dwfx, easm, jww, jwc, sfc, stp, p21, ifc, catpart, cgr, bfo, pxt, 3mf
Geospatial (ESRI / Shapefile)	shp, shx, prj, sbn, sbx, gdbtable, lpkx, mpkx
ML model	onnx, gguf, sts, parquet
Font	eot, otf, woff
Database	dbf
Email and contact	vcf, vcs, ics
Other	aem, dpa, lnk, url, nrbf, ribcd, crl

Formats are added continuously, check the release notes of each version for newly supported types

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