Search notes:

Access Object Model: Application.GUIDFromString

GUIDFromString() returns an array of bytes: 
? typeName(guidFromString("{A7CC3DA6-ABFB-E911-81A1-005056938A20}"))
Byte()
The size of this byte array is 16 (as expected): 
g =guidFromString("{A7CC3DA6-ABFB-E911-81A1-005056938A20}")
? ubound(g) - lbound(g) + 1
 16

See also

Selecting records which are identified by GUIDs.
MS-Access GUID test
The application object.

Index

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/Microsof...', 1742014752, '3.145.100.96', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/Microsoft/Office/Access/Object-Model/Application/GUIDFromString(50): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78