Certain filetypes cannot be started from without MS Outlook
This is by design (security feature)
This MS security feature was implemented to protect you from naively or accidentally double-clicking an attachment of uncertain origin.
What if know it's safe and you just want this thing to work (and you made sure it's safe...)?
Under the following key are exceptions defined, Outlook let's you to open without asking:
(11.0: Office 2003, 10.0: Office XP)
Value (just make the exceptions, you really want to. Single values must be seperated by semi-colon):
ade; adp; asx; bas; bat; chm; cmd; com; cpl; crt; exe; hlp; hta; inf; ins; isp; js; jse; lnk; mda; mdb; mde; mdz; msc; msi; msp; mst; pcd; pif; prf; reg; scf; scr; sct; shb; shs; url; vb; vbe; vbs; wsc; wsf; wsh
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.