Finally it had worked. I was able to successfully run chgdtype.tbs from within my Win7. The former GPT disk appeared in BIBM as MBR.
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Note:
It would have taken some fears from me if I had seen a screenshot of the summary of actions to be performed by the script before (although it is described verbally in KB 492). Perhaps it is present in some tutorial, I don't know. But for the benefit of those readers who have come across this thread e.g. via Google l add this screenshot to the Attachments of this posting (Att.1)
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The converted partition containing Win 8.1 could not be resized. An error message was returned telling me that I should run chkdsk /f or scandisk (cf. Att.2).
I then created a Boot Item for Win8 but it could not be booted.
Here is what I did then:
1. I booted the TBWinRE-CD, which I had created in Win7 shortly before the conversion and chose the System Recovery Option in TBLauncher. It produced the repair details shown in Att.3. However, when I started the recovery option and restarted the system I did not perceive any change. Win 8.1 was unbootable as before and the error message upon Resize was still there.
2. So I ran chkdsk /f /r F: from within Win7 (if I remember correctly, the Win8 partition at that time had the drive letter (F:) in Win7). One Login later it was (D:)
3. After restart I ran successfully BCD Edit in BIBM for the Win 8 partition (named "Boot") in accordance with Knowledge Base Article 492.
4. Thereafter I succeeded to boot the Win8 partition, chkdsk was executed and appeared to have stopped after 10 minutes at 11 % (progress bar). But when I came back after 2 hours it showed 100 % and I could login normally.
5. I could verify that the Win8 partition can now be resized However, BIBM and Win8 Disk Manager offer different minimum sizes. I will discuss this in my other current thread
viewtopic.php?f=2&t=1928&start=70