<course code> – <year>-<quarter> [ Instr ] [ Internal ] [ Scan ] – { A4 | Ltr | Show } – <course name>.<extension>
Where:
Instr – instructors manual (if not present it is automatically participants manual)
Internal – internal document (usually locked against printing and copy&paste operations)
Scan – scanned document (no able to search – only pictures)
A4 – paper format A4
Ltr – paper format Letter
Show – slide show presentation
<course code>_<language>_Col<collection>_FV_{ Part | Inst }_{ A4 | Ltr }.pdf
for example: HR550_EN_Col52_FV_Part_A4.pdf
Where:
Part – participant manual
Inst – instructor manual
A4 – paper format A4
Ltr – paper format letter
look on course:
EP200_-_2004-Q2_Instr_-_Ltr_-_SAP_Enterprise_Portal_System_Administration.pdf
you can find the course in the "Download All SAP Materials – A TO Z ! Free SAP Tutorials" thread – you have instructor course in Ltr format.
I think that in europe A4 format is normal and in USA letter format is common. SAP is not so common in US like in Europe – maybe that is reason why most of the courses are in A4 format.