diff --git a/config/application.yml.default b/config/application.yml.default
index 8327dc659..fcbd6bee2 100644
--- a/config/application.yml.default
+++ b/config/application.yml.default
@@ -92,7 +92,7 @@ DISK_SPACE_MB_ALERT: '100'
 SUPERADMIN_EMAIL: 'admin@sleede.com'
 
 ALLOWED_EXTENSIONS: pdf ai eps cad math svg stl dxf dwg obj step iges igs 3dm 3dmf doc docx png ino scad fcad skp sldprt sldasm slddrw slddrt tex latex ps fcstd fcstd1
-ALLOWED_MIME_TYPES: application/pdf application/postscript application/illustrator image/x-eps image/svg+xml application/sla application/dxf application/acad application/dwg application/octet-stream application/step application/iges model/iges x-world/x-3dmf application/vnd.openxmlformats-officedocument.wordprocessingml.document image/png text/x-arduino text/plain application/scad application/vnd.sketchup.skp application/x-koan application/vnd-koan koan/x-skm application/vnd.koan application/x-tex application/x-latex
+ALLOWED_MIME_TYPES: application/pdf application/postscript application/illustrator image/x-eps image/svg+xml application/sla application/dxf application/acad application/dwg application/octet-stream application/step application/iges model/iges x-world/x-3dmf application/vnd.openxmlformats-officedocument.wordprocessingml.document image/png text/x-arduino text/plain application/scad application/vnd.sketchup.skp application/x-koan application/vnd-koan koan/x-skm application/vnd.koan application/x-tex application/x-latex application/x-extension-fcstd
 
 # 5242880 = 5 megabytes
 MAX_IMPORT_SIZE: '5242880'
diff --git a/docker/env.example b/docker/env.example
index 0717f6fed..858c8233f 100644
--- a/docker/env.example
+++ b/docker/env.example
@@ -77,7 +77,7 @@ SUPERADMIN_EMAIL='admin@sleede.com'
 
 
 ALLOWED_EXTENSIONS=pdf ai eps cad math svg stl dxf dwg obj step iges igs 3dm 3dmf doc docx png ino scad fcad skp sldprt sldasm slddrw slddrt tex latex ps fcstd fcstd1
-ALLOWED_MIME_TYPES=application/pdf application/postscript application/illustrator image/x-eps image/svg+xml application/sla application/dxf application/acad application/dwg application/octet-stream application/step application/iges model/iges x-world/x-3dmf application/ application/vnd.openxmlformats-officedocument.wordprocessingml.document image/png text/x-arduino text/plain application/scad application/vnd.sketchup.skp application/x-koan application/vnd-koan koan/x-skm application/vnd.koan application/x-tex application/x-latex
+ALLOWED_MIME_TYPES=application/pdf application/postscript application/illustrator image/x-eps image/svg+xml application/sla application/dxf application/acad application/dwg application/octet-stream application/step application/iges model/iges x-world/x-3dmf application/ application/vnd.openxmlformats-officedocument.wordprocessingml.document image/png text/x-arduino text/plain application/scad application/vnd.sketchup.skp application/x-koan application/vnd-koan koan/x-skm application/vnd.koan application/x-tex application/x-latex application/x-extension-fcstd
 
 # 5242880 = 5 megabytes
 MAX_IMPORT_SIZE = '5242880'