The Microsoft Office Subject Interface Packages for Digitally Signing VBA Projects (https://www.microsoft.com/en-us/download/details.aspx?id=56617) sounded very interesting, but unfortunately it seems not to support Microsoft Access:
Also in the binary "msosipx.dll" I couln't find any occurrences of the strings "accdb" or "accde" (whereas I was able to find "vsdm" or "docm").
Code:
SUPPORTED FILE FORMATS
MSOSIP:
Excel: .xla, .xls, .xlt
PowerPoint: .pot, .ppa, .pps, .ppt
Project: .mpp, .mpt
Publisher: .pub
Visio: .vdw, .vdx, .vsd, .vss, .vst, .vsx, .vtx
Word: .doc, .dot, .wiz
MSOSIPX:
Excel: .xlam, .xlsb, .xlsm, .xltm
PowerPoint: .potm, .ppam, .ppsm, .pptm
Visio: .vsdm, .vssm, .vstm
Word: .docm, .dotm
Also in the binary "msosipx.dll" I couln't find any occurrences of the strings "accdb" or "accde" (whereas I was able to find "vsdm" or "docm").